usb: dwc3-msm: Remove arch-specific includes

Replace mach-msm specific headers with generic
equivalents in order to support compilation on arm64.
Also remove rpm-regulator*.h as they're no longer needed.

Change-Id: I53a0f195d24d5e6a7a8f5b1f0757cb8cf2df5378
Signed-off-by: Jack Pham <jackp@codeaurora.org>