Add cortex-m55 to CMake support#14213

Merged

0xc0170 merged 2 commits intoARMmbed:masterfrom

0xc0170:dev_add_cortexm55

Feb 3, 2021

Commits on Jan 28, 2021

Add cortex-m55 to CMake support
0xc0170
committed

Commits on Jan 29, 2021

CMake rtos: add M55 to irq handlers, use m33 handlers = the same
0xc0170
committed