[CMSIS_5]: Updated to b5f0603d6

[CMSIS_5]: Updated to ca812421

Check correct ARMC6 predefine for FP codegen ...

For ARMC6, CMSIS headers were checking the `__ARM_PCS_VFP`, which
indicates hardfp ABI in use, when they need to check whether FP
code generation is enabled. Change this to `__ARM_FP`, so it
works for platforms using softfp ABI.

Change already present in CMSIS_5 repo, via commit
969822a, but redone with local
search-and-replace.

[CMSIS_5]: Updated to 0b521765