mmc: sdhci-msm: Port base platform driver from 4.14 to 4.19

Port base platform driver from kernel 4.14 to 4.19.
This change brings in the base driver required to run basic
eMMC and SDCard driver and on top of this rest feature is
ported and enabled.
These files are taken from the 4.14 kernel directly, with some
feature removed, which are ported in subsequent change.

Change-Id: Ic331e507f2387a6d710b135ba96fe4565cadecbb
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>