msm_shared: Align and round up the scm cmd memory to CACHE_LINE boundary.

(cherry picked from commit 904f8f8ad9c20efa96ff6e22e084fd1309f79eba)

Change-Id: Iea10a4312912605fa1f616be14f76c3ad2dc1665
CRs-Fixed: 428568
Merge "msm_shared: Align and round up the scm cmd memory to CACHE_LINE boundary."