msm: Rename msmskunk and sdmbat to sdm845 and sdm830

Rename all cases of msmskunk and sdmbat to sdm845 and sdm830
respectively.

Change-Id: Ia0c9a5ed0e4ebad696a62817c967e9baa7885f0f
Signed-off-by: Kyle Yan <kyan@codeaurora.org>
[cang@codeaurora.org: Only picked up UFS related
changes, resolved merge conflicts and fixed kernel
compilation errors]
Signed-off-by: Can Guo <cang@codeaurora.org>