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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I73c44528060181ae9f6e7d84b95a73331a95ebae