CMake: fix for CMAKE_CURRENT_LIST_DIR in functions

CMAKE_CURRENT_LIST_DIR behaves differently in functions. We store it in the CMakeLists itself, so anyone
calling a function would get the actual list dir where the scripts are.

To illustrate: if I call a function from src/CMakelists.txt, function located in src/scripts, `CMAKE_CURRENT_LIST_DIR` in the function would point
to the src/ folder but not to src/scripts.

Author: 0xc0170

platform/FEATURE_EXPERIMENTAL_API/FEATURE_PSA/TARGET_TFM/TARGET_TFM_LATEST/scripts/mbed_set_post_build_tfm.cmake

@@ -3,6 +3,8 @@
 
 include(mbed_set_post_build)
 
+set(MBED_POST_BUILD_TFM_DIR "${CMAKE_CURRENT_LIST_DIR}")
+
 #
 # Sign TF-M secure and non-secure images and combine them with the bootloader
 #
@@ -17,7 +19,7 @@ function(mbed_post_build_tfm_sign_image
     set(mbed_target_name ${mbed_target})
     set(post_build_command
         COMMAND ${Python3_EXECUTABLE}
-            ${CMAKE_CURRENT_LIST_DIR}/scripts/generate_mbed_image.py
+            ${MBED_POST_BUILD_TFM_DIR}/generate_mbed_image.py
             --tfm-target ${tfm_target}
             --target-path ${target_path}
             --secure-bin ${secure_bin}

targets/TARGET_Cypress/scripts/mbed_set_post_build_cypress.cmake

@@ -3,6 +3,8 @@
 
 include(mbed_set_post_build)
 
+set(MBED_POST_BUILD_CYPRESS_DIR "${CMAKE_CURRENT_LIST_DIR}")
+
 #
 # Merge Cortex-M4 HEX and a Cortex-M0 HEX.
 #
@@ -20,15 +22,15 @@ function(mbed_post_build_psoc6_merge_hex mbed_target_name)
         # Get extra argument as `cortex_m0_hex`
         list(GET extra_macro_args 0 cortex_m0_hex)
         set(post_build_command
-            COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_LIST_DIR}/PSOC6.py
+            COMMAND ${Python3_EXECUTABLE} ${MBED_POST_BUILD_CYPRESS_DIR}/PSOC6.py
                 merge
                 --elf ${CMAKE_BINARY_DIR}/$<TARGET_PROPERTY:mbed-post-build-bin-${mbed_target_name},application>.elf
                 --m4hex ${CMAKE_BINARY_DIR}/$<TARGET_PROPERTY:mbed-post-build-bin-${mbed_target_name},application>.hex
                 --m0hex ${cortex_m0_hex}
         )
     else()
         set(post_build_command
-            COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_LIST_DIR}/PSOC6.py
+            COMMAND ${Python3_EXECUTABLE} ${MBED_POST_BUILD_CYPRESS_DIR}/PSOC6.py
                 merge
                 --elf ${CMAKE_BINARY_DIR}/$<TARGET_PROPERTY:mbed-post-build-bin-${mbed_target_name},application>.elf
                 --m4hex ${CMAKE_BINARY_DIR}/$<TARGET_PROPERTY:mbed-post-build-bin-${mbed_target_name},application>.hex
@@ -54,7 +56,7 @@ function(mbed_post_build_psoc6_sign_image
     find_package(Python3)
 
     set(post_build_command
-        COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_LIST_DIR}/PSOC6.py
+        COMMAND ${Python3_EXECUTABLE} ${MBED_POST_BUILD_CYPRESS_DIR}/PSOC6.py
             sign
             --build-dir ${CMAKE_BINARY_DIR}
             --m0hex-filename ${m0hex_filename}

targets/TARGET_NXP/scripts/mbed_set_post_build_nxp.cmake

@@ -3,14 +3,16 @@
 
 include(mbed_set_post_build)
 
+set(MBED_POST_BUILD_NXP_DIR "${CMAKE_CURRENT_LIST_DIR}")
+
 #
 # Patch an LPC target vector table in the binary file.
 #
 function(mbed_post_build_lpc_patch_vtable mbed_target_name)
     find_package(Python3)
 
     set(post_build_command
-        COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_LIST_DIR}/LPC.py
+        COMMAND ${Python3_EXECUTABLE} ${MBED_POST_BUILD_NXP_DIR}/LPC.py
         ${CMAKE_BINARY_DIR}/$<TARGET_PROPERTY:mbed-post-build-bin-${mbed_target_name},application>.bin
     )