Fix PORTENTA_H7_xx targets

Author: rwalton-arm

targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H747xI/TARGET_PORTENTA_H7/CMakeLists.txt

@@ -1,18 +1,35 @@
 # Copyright (c) 2020 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-add_library(mbed-portenta-h7 INTERFACE)
+add_library(mbed-portenta-h7-m4 INTERFACE)
 
-target_sources(mbed-portenta-h7
+target_sources(mbed-portenta-h7-m4
     INTERFACE
         PeripheralPins.c
         system_clock_override.c
         portenta_power.cpp
 )
 
-target_include_directories(mbed-portenta-h7
+target_include_directories(mbed-portenta-h7-m4
     INTERFACE
         .
 )
 
-target_link_libraries(mbed-portenta-h7 INTERFACE mbed-stm32h747xi)
+target_link_libraries(mbed-portenta-h7-m4 INTERFACE mbed-stm32h747xi-cm4)
+
+
+add_library(mbed-portenta-h7-m7 INTERFACE)
+
+target_sources(mbed-portenta-h7-m7
+    INTERFACE
+        PeripheralPins.c
+        system_clock_override.c
+        portenta_power.cpp
+)
+
+target_include_directories(mbed-portenta-h7-m7
+    INTERFACE
+        .
+)
+
+target_link_libraries(mbed-portenta-h7-m7 INTERFACE mbed-stm32h747xi-cm7)