scsi: ufs: Add new file ufs-msm.h

At the current implementation all the enums structs and defintions
defined at the ufs-msm.c. In order to share those definitions with
other files, we expose them at ufs-msm.h

Change-Id: I12fe3b9a51c86b5bf6584c2de65de40749ef5693
Signed-off-by: Raviv Shvili <rshvili@codeaurora.org>