Support building host/vendor variants for tflite. am: f4b3397af2 am: be121f1b51 am: cedb0e1af3 am: 543dbeb407

Original change: https://android-review.googlesource.com/c/platform/external/gemmlowp/+/1564337

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ifde83aec85f5399d531333b5fb4180ae7990e178