mmc: Merge MMC driver's changes from kernel msm-4.14 to msm-4.19

This is a snapshot of the mmc module taken as of msm-4.14
commit <9fa809c7>. This change contains the MMC driver's
changes for merging from kernel version msm-4.14 to msm-4.19.

Change-Id: I89fa8d5681d18290bbaf8b500f2e7f4a8aebbd89
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>