Revert "Remove redundant null_blk and scsi_debug vendor kernel modules" am: c6bef60fb7

Original change: https://partner-android-review.googlesource.com/c/kernel/private/devices/google/felix/+/2761451

Change-Id: Ie6887211037ef8eb6709e57d45db235359c0600d
Signed-off-by: Automerger Merge Worker <[email protected]>