usb: dwc3: Add QTI MSM platform specific feature and other changes

This change adds the following QTI MSM platform specific features
to the USB DWC3 core & gadget drivers:
- BAM endpoint support
- GSI endpoint support
- low power mode / remote wakeup
- function suspend/wake
- glue layer notifications
- high speed-only fallback
- add additional debug logging

Change-Id: I0f733d05f3f88a4a734d8489b5eb548391ab3af3
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>