minigbm: Link amdgpuaddr for DRV_AMDGPU.

The amdgpu driver requires functions provided by amdgpuaddr:
  * AddrComputeSurfaceInfo
  * AddrConvertTileInfoToHW
  * AddrCreate
  * AddrDestroy

We need to link against amdgpuaddr when using this driver.

BUG=b:64515630
TEST=Built modified arc-cros-gralloc, got ARC++ graphics on AMD

Change-Id: I5bfa32f0c912ac5d3a19ab4f337614a1d91a6328
Reviewed-on: https://chromium-review.googlesource.com/726364
Commit-Ready: Justin TerAvest <teravest@chromium.org>
Tested-by: Justin TerAvest <teravest@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
diff --git a/cros_gralloc/Makefile b/cros_gralloc/Makefile
index 17e884f..1583a6f 100644
--- a/cros_gralloc/Makefile
+++ b/cros_gralloc/Makefile
@@ -21,6 +21,10 @@
 CFLAGS   += -std=c99
 LIBS     += -shared -lcutils -lhardware -lsync $(LIBDRM_LIBS)
 
+ifdef DRV_AMDGPU
+	LIBS += -lamdgpuaddr
+endif
+
 OBJS =  $(foreach source, $(SOURCES), $(addsuffix .o, $(basename $(source))))
 
 OBJECTS = $(addprefix $(TARGET_DIR), $(notdir $(OBJS)))