Revert "Upgrade kernel to 4.19 gki and uploaded gki modules"

This reverts commit 2f8ae471528c03e36da0e91fe78e1c94830442cf.

Reason for revert: b/141634397 discussion here

Change-Id: Ic6cb055259cf47c2ea111e00b61a655d0904329b
53 files changed