Optimized ARM RWSEM algorithm
RWSEM implementation for ARM using atomic functions.
Heavily based on arch/sh/include/asm/rwsem.h

Signed-off-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: GuneetAtwal <harjinder767@gmail.com>