Remove unnecessary Android.mk in device/google/tangorpro am: 29713d8b37 am: aaad3c04a7

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

Change-Id: I11940644d5fc09d1b29a7cfcaa791791e8dec9c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>