msm: mdss: Prevent excessive logging during rotation set failure

Changing the error log to debug log in case SMP reserve fails
for rotation. The use case falls back to GPU. Same is being
done in  case of mdp interface set path.

Change-Id: I00a9e05b3a04a87e354fd0e60ad900f4f71cdfc1
Signed-off-by: Vineet Bajaj <vbajaj@codeaurora.org>
msm: mdss: fix race condition between shutdown thread and fb ioctl

Currently all entires into fb driver are synchronized with shutdown
context except fb ioctl context. fb ioctl is an asynchronous entry to
fb driver which can be called simultaneously from two different user
processes. Synchronize these fb ioctls and shutdown context to prevent
race condition.

Change-Id: I81ce48159fce69caabc3336d70df2bd15c4ee44b
CRs-Fixed: 640199
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>