Allow the UAL APSR_nzcv format for the mrc and mrc2 instructions. The clang
integrated assembler only allows these forms so binutils will need to
support them.

MFC after:	1 Week
Sponsored by:	AB Systems Ltd
Fix the name of the coprocessor to include the "p" prefix, the clang
integrated assembler expects this.

MFC after:	1 Week
Sponsored by:	ABT Systems Ltd