msm: remote_spinlock: implement sfpb trylock

The trylock API for sfpb remote spinlock implementation is stubbed out.
This is a problem as "msm: smd: Add remote spinlock init check" adds a
usecase for the trylock API provided by remote_spinlock.  Implement the
sfpb trylock so that the usecase remains functionally correct on targets
using sfpb remote spinlocks.

Change-Id: Ic6a05b42cc944e5613deb68b750a46abf75dfd29
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
1 file changed