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.

Bug 1465246

Change-Id: I4a9ca34fa161a0f306cdb663827d9bee39cec733
Signed-off-by: Alex Van Brunt <avanbrunt@nvidia.com>
Reviewed-on: http://git-master/r/370278
Git-commit: 8dade2fac268edbad06e9aea9e7869f40f3a222f
Git-repo: https://android.googlesource.com/kernel/tegra


Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>