Rename amlogic backend in minigbm into meson

The name of Amlogic DRM driver in kernel is "meson", so rename it in
minigbm to match that.

BUG=internal b/74248568
TEST=run ozone_demo on device

Change-Id: If2ef376715231f0b3c9fe320177d0e82d94214f0
Reviewed-on: https://chromium-review.googlesource.com/951912
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Tested-by: Sergey Volk <servolk@chromium.org>
diff --git a/Android.mk b/Android.mk
index 3f73fe5..28176d2 100644
--- a/Android.mk
+++ b/Android.mk
@@ -16,7 +16,6 @@
 
 LOCAL_SRC_FILES := \
 	amdgpu.c \
-	amlogic.c \
 	cirrus.c \
 	drv.c \
 	evdi.c \
@@ -25,6 +24,7 @@
 	i915.c \
 	marvell.c \
 	mediatek.c \
+	meson.c \
 	msm.c \
 	nouveau.c \
 	rockchip.c \