Remove unused NUCLEO_H743ZI target files

Author: gpsimenos

targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H743xI/CMakeLists.txt

@@ -1,7 +1,6 @@
 # Copyright (c) 2020 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-add_subdirectory(TARGET_NUCLEO_H743ZI EXCLUDE_FROM_ALL)
 add_subdirectory(TARGET_NUCLEO_H743ZI2 EXCLUDE_FROM_ALL)
 
 if(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")