m68k: implement move to/from usp register instruction

m68k: implement move to/from usp register instruction

Fill out the code support for the move to/from usp instructions. They are
being decoded, but there is no code to support there actions. So add it.

Current versions of Linux running on the ColdFire 5208 use these instructions.

Signed-off-by: Greg Ungerer <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Reviewed-by: Laurent Vivier <[email protected]>
Tested-by: Laurent Vivier <[email protected]>
Message-id: 1434721406[email protected]
Signed-off-by: Peter Maydell <[email protected]>