Add dwc3-msm.c and associated driver files. Note these are
based on the downstream implementation and will coexist
(for the time being) with dwc3-qcom glue driver until they
can eventually be merged.
This snapshot is taken as of msm-3.18 commit a3883c356869 (Merge "input:
touchscreen: correct condition checks in ITE tech touch driver")
Signed-off-by: Jack Pham <jackp@codeaurora.org>