linux-postmarketos-exynos4: upgrade to version 6.3-rc7
Switch over to using gitlab.com/exynos4-mainline/linux to get source, so that we do not have to carry all the patches here in pmaports. Me and @Newbyte are admins at the moment and can hand out access to anyone who wants to keep WIP branches or whatever in that repo.
The patches have been rebased, and some additional improvements include:
- The HDMI hack we had to workaround a phosh issue has been removed, and replaced with a few patches to improve the sii9234 mhl bridge driver. Some more work is needed before those can be sent upstream.
- Patches to get fixed mmc indeces have been added
Tested on samsung-m0, would be great if someone could test on an exynos4210 device.