arm64: add fault handling to SWP emulation

Add excpetion table and fixup for SWP/SWPB instruction emulation.
This prevents the kernel from panicing when emulating a SWP/SWPB
instruction that access unmapped memory.

Change-Id: I4a9ca34fa161a0f306cdb663827d9bee39cec733
Signed-off-by: Alex Van Brunt <avanbrunt@nvidia.com>
Reviewed-on: http://git-master/r/370278