Revert "gav1: support 444 and 422 for 10bit (YV12/P010 paths)"

This reverts commit bcde4bee.

This change is not compatible with mainline. Reverting it and landing a
compatible version will make for an easier set of cherry-picks.

I?10ToP010 were added in:
  7ed0473 Update external/libyuv to r1837
and upstream in version 1779.

libyuv is not a part of mainline and is currently at libyuv version
1732.

Bug: 261112792
Bug: 279553165
Test: compile
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:dbc545bb8edfe3c7f1dfd6d64a605a91b434175e)
Merged-In: I71073bc520cb7307d5e5b708753614831fa68246
Change-Id: I71073bc520cb7307d5e5b708753614831fa68246