Remove unnecessary Android.mk in device/google/tangorpro am: 29713d8b37 am: d9c18ccebe am: a44c763e03

Original change: https://android-review.googlesource.com/c/device/google/tangorpro/+/2836335

Change-Id: If4d9c0263026d3a673046dfe08288d9afede9af1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>