msm: remote_spinlock: compile SWP based software locks only if <ARMv6

SWP instructions are deprecated on modern ARM architectures, namely >ARMv5

Change-Id: I94116abbe0205b7738860c426f1f990594e3da8c
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
Add LK 3.4 gitignore

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>