MIPS: CPC: provide functions to retrieve register addresses
MIPS: CPC: provide functions to retrieve register addresses

This patch introduces addr_ functions in addition to the existing read_
& write_ functions. The new functions simply return the address of the
appropriate CPC register rather than performing a memory access. This
will be used in a subsequent patch.

Signed-off-by: Paul Burton <85f1bffadddedccfafc0ae065a06aa636075387f@imgtec.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs