Revert^2 "Block new Android.mk added to all directories except the directories for partners"

This reverts commit a60960b3.

Reason for revert: reland

Add "bootable/deprecated-ota/updater/Android.mk" in variable "androidmk_allowlist" instead of the file allowlist.txt since some branches might not have vendor/ so allowlist.txt is not availble.

go/abtd/run/L32300030010515897 to test this CL with the broken branch.

Change-Id: I4b0fb0628f3b995fac340a3e391940b7a6045246