Platform: Support isolation level 2 for MUSCA_B1

- Add MUSCA_B1 TARGET_PLATFORM in ConfigCoreIPCTfmLevel2.cmake.
- Re-arrange the placement of secure partition in ARMCLANG linker file.
- Add start and end address for PSA and App RoT in ARMCLANG linker file.
- Add MPU config for App RoT.

Change-Id: I2c7c3f04e6183e986502d142397658d373948260
Signed-off-by: Edison Ai <edison.ai@arm.com>
4 files changed