CMake: Fix ARM MUSCA NS targets build

Add the missing CMake targets for NS Mbed boards.

Author: hugueskamba

targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/CMakeLists.txt

@@ -1,4 +1,4 @@
-# Copyright (c) 2020 ARM Limited. All rights reserved.
+# Copyright (c) 2020-2021 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 add_library(mbed-arm-musca-b1 INTERFACE)
@@ -55,3 +55,10 @@ target_link_libraries(mbed-arm-musca-b1
         ${CMAKE_CURRENT_SOURCE_DIR}/s_veneers.o
         mbed-arm-ssg
 )
+
+add_library(mbed-arm-musca-b1-ns INTERFACE)
+
+target_link_libraries(mbed-arm-musca-b1-ns
+    INTERFACE
+        mbed-arm-musca-b1
+)

targets/TARGET_ARM_SSG/TARGET_MUSCA_S1/CMakeLists.txt

@@ -1,4 +1,4 @@
-# Copyright (c) 2020 ARM Limited. All rights reserved.
+# Copyright (c) 2020-2021 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 add_library(mbed-arm-musca-s1 INTERFACE)
@@ -61,3 +61,10 @@ target_link_libraries(mbed-arm-musca-s1
         ${CMAKE_CURRENT_SOURCE_DIR}/s_veneers.o
         mbed-arm-ssg
 )
+
+add_library(mbed-arm-musca-s1-ns INTERFACE)
+
+target_link_libraries(mbed-arm-musca-s1-ns
+    INTERFACE
+        mbed-arm-musca-s1
+)