CMake: Rename Mbed OS path variable for consistency

Rename the CMake variable expected from applications from MBED_ROOT to
MBED_PATH to be consistent with the naming used for the configuration file
(MBED_CONFIG_PATH) also expected from applications.

CMakeLists.txt

@@ -10,8 +10,8 @@ if(POLICY CMP0076)
     cmake_policy(SET CMP0076 NEW)
 endif()
 
-include(${MBED_ROOT}/tools/cmake/core.cmake)
-include(${MBED_ROOT}/tools/cmake/profile.cmake)
+include(${MBED_PATH}/tools/cmake/core.cmake)
+include(${MBED_PATH}/tools/cmake/profile.cmake)
 
 add_library(mbed-core INTERFACE)
 
@@ -185,7 +185,7 @@ function(mbed_generate_map_file target)
          TARGET
              ${target}
          POST_BUILD
-             COMMAND ${Python3_EXECUTABLE} ${MBED_ROOT}/tools/memap.py -t ${MBED_TOOLCHAIN} -d 4 ${CMAKE_BINARY_DIR}/${target}${CMAKE_EXECUTABLE_SUFFIX}.map
+             COMMAND ${Python3_EXECUTABLE} ${MBED_PATH}/tools/memap.py -t ${MBED_TOOLCHAIN} -d 4 ${CMAKE_BINARY_DIR}/${target}${CMAKE_EXECUTABLE_SUFFIX}.map
          WORKING_DIRECTORY
              ${CMAKE_BINARY_DIR}
          COMMENT

docs/design-documents/tools/cmake.md

@@ -46,7 +46,7 @@ The next sections will describe static CMake files within Mbed OS Core repositor
 
 The `CMakeLists.txt` entry point in the root of the Mbed OS repository contains the top level build specification for Mbed OS. This file also includes the auto generated `mbed_config.cmake` script, which is created by `mbed-tools`.
 
-This is not intended to be included by an application. Applications must use `add_subdirectory(${MBED_ROOT})`.
+This is not intended to be included by an application. Applications must use `add_subdirectory(${MBED_PATH})`.
 
 ### 2. Toolchain CMake Scripts
 

tools/cmake/app.cmake

@@ -11,9 +11,9 @@ include(${MBED_CONFIG_PATH}/mbed_config.cmake)
 
 # Set default toolchain file
 if(NOT CMAKE_TOOLCHAIN_FILE)
-    set(CMAKE_TOOLCHAIN_FILE "${MBED_ROOT}/tools/cmake/toolchain.cmake" CACHE INTERNAL "")
+    set(CMAKE_TOOLCHAIN_FILE "${MBED_PATH}/tools/cmake/toolchain.cmake" CACHE INTERNAL "")
 endif()
 
 # Toolchain setup
-include(${MBED_ROOT}/tools/cmake/toolchains/${MBED_TOOLCHAIN}.cmake)
+include(${MBED_PATH}/tools/cmake/toolchains/${MBED_TOOLCHAIN}.cmake)
 enable_language(C CXX ASM)

tools/cmake/core.cmake

@@ -1,4 +1,4 @@
 # Copyright (c) 2020 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-include(${MBED_ROOT}/tools/cmake/cores/${MBED_CPU_CORE}.cmake)
+include(${MBED_PATH}/tools/cmake/cores/${MBED_CPU_CORE}.cmake)

tools/cmake/profile.cmake

@@ -29,4 +29,4 @@ else()
     endif()
 endif()
 
-include(${MBED_ROOT}/tools/cmake/profiles/${LOWERCASE_CMAKE_BUILD_TYPE}.cmake)
+include(${MBED_PATH}/tools/cmake/profiles/${LOWERCASE_CMAKE_BUILD_TYPE}.cmake)