Add dri.c to the MINIGBM_SRC list

dri.c needs to be included in the minigbm build because it is required
when using an AMD gpu.

Bug: chromium:967346
Change-Id: I642836bb970d2b738c98a9869a245ca36c80f3ed
Reviewed-on: https://chromium-review.googlesource.com/1631282
Commit-Ready: Daniel Nicoara <dnicoara@chromium.org>
Tested-by: Daniel Nicoara <dnicoara@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
diff --git a/Android.mk b/Android.mk
index 9169cef..564f416 100644
--- a/Android.mk
+++ b/Android.mk
@@ -9,6 +9,7 @@
 
 MINIGBM_SRC := \
 	amdgpu.c \
+	dri.c \
 	drv.c \
 	evdi.c \
 	exynos.c \