Rename gbm -> gbm_mesa am: 47ee478657 am: 75cea46e8e am: 54d530904a am: 1f0d1e48c8

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1416690

Change-Id: I2bf6c6c9b59952031fbdb58dc786ba0a1232992a