USB OTG status tracking

This is a tracking issue for USB OTG support on devices supported by the exynos4-mainline kernel.

Status as of 6.10 kernel

OTG not working is a combination of three factors (the first two of which are specific to devices with the MAX77693 MFD)

• Extcon bug fixes
  • We have some hacks to fix this; clean up and upstream them
• OTG mode support for MAX77693 charger
  • Finish upstreaming
• Fix enabling the hsotg and ehci nodes at the same time causing peripheral mode to stop working
  • We have a hack for this, but it's likely not a perfect solution - if DWC gadget mode restarts while we're in host mode, peripheral mode breaks completely until restart. Needs investigation.