pan/bi: Fix Android.mk

Files listed in Makefile.sources did not exist, this affects the android
build for other drivers as well.

[Patch by Tapani manually cherrypicked into this branch]

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Marge Bot <mesa/mesa!4097>
Part-of: <mesa/mesa!4097>
45 jobs for !4097 with bi-emit-v5 in 16 minutes and 56 seconds (queued for 5 seconds)
merge request