target/mips: Add CP0 register MemoryMapID

Add CP0 register MemoryMapID. Only data field is added.
The corresponding functionality will be added in future
patches.

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
2 files changed