Switch to using TARGET_TFM_V1_2

* Rename the folder from `TARGET_TFM_V1_1` to `TARGET_TFM_V1_2`
* Update the CmakeLists.txt
* Change the name of the MUSCA targets to maintain uniformity
with TF-M v1.2
* Update target.json for PSA_V8_M to use `TF_Mv1_2`

Author: jainvikas8

platform/FEATURE_EXPERIMENTAL_API/FEATURE_PSA/TARGET_TFM/CMakeLists.txt

@@ -5,6 +5,6 @@ if("TFM_V1_0" IN_LIST MBED_TARGET_LABELS)
     add_subdirectory(TARGET_TFM_V1_0)
 endif()
 
-if("TFM_V1_1" IN_LIST MBED_TARGET_LABELS)
-    add_subdirectory(TARGET_TFM_V1_1)
+if("TFM_V1_2" IN_LIST MBED_TARGET_LABELS)
+    add_subdirectory(TARGET_TFM_V1_2)
 endif()

platform/FEATURE_EXPERIMENTAL_API/FEATURE_PSA/TARGET_TFM/TARGET_TFM_V1_1/CMakeLists.txt renamed to platform/FEATURE_EXPERIMENTAL_API/FEATURE_PSA/TARGET_TFM/TARGET_TFM_V1_2/CMakeLists.txt

@@ -144,7 +144,7 @@
         ],
         "extra_labels": [
             "TFM",
-            "TFM_V1_1",
+            "TFM_V1_2",
             "TFM_V8M"
         ],
         "device_has": [
@@ -4639,7 +4639,7 @@
             "function": "ArmMuscaB1Code.binary_hook"
         },
         "secure_image_filename": "tfm_s.bin",
-        "tfm_target_name": "MUSCA_B1",
+        "tfm_target_name": "musca_b1",
         "tfm_bootloader_supported": true,
         "tfm_default_toolchain": "ARMCLANG",
         "tfm_supported_toolchains": [
@@ -4696,7 +4696,7 @@
             "function": "ArmMuscaS1Code.binary_hook"
         },
         "secure_image_filename": "tfm_s.bin",
-        "tfm_target_name": "MUSCA_S1",
+        "tfm_target_name": "musca_s1",
         "tfm_bootloader_supported": true,
         "tfm_default_toolchain": "ARMCLANG",
         "tfm_supported_toolchains": [