rootdir: enable armv8_deprecated swp hook

The upstream kernel now includes support for emulating legacy AArch32
instructions on ARMv8 devices.  By default this framework emulates
deprecated instructions but not obsolete instructions.

Android requires support for the obsolete SWP and SWPB instructions on
all ARM devices, so override this default for the swp emulation hook.

Change-Id: I82b9bdb564413ec7c1a101da75a9928aebe1606b
Signed-off-by: Greg Hackmann <ghackmann@google.com>