Core(M): Fixed device config checks for missing defines.

- Added __VTOR_PRESENT to all VTOR-capable cores, defaulting to 1.
- Added __FPU_DP, __DCACHE_PRESENT and __ICACHE_PRESENT to Armv8.1-M cores.
- Updated defines to affected device headers.

Change-Id: I3e0c6a35e4b526b46c583566e2adc69d89b7020a