hikey: enable HIDL HWC

This will use FB->HWC2 adapter.

Test: boots hikey and hikey960
Change-Id: I70995d71f70c3cf6bd3bbaca8756ee0a6644b32a
diff --git a/device-common.mk b/device-common.mk
index d3476b5..21959b5 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -58,6 +58,7 @@
 # Graphics HAL
 PRODUCT_PACKAGES += \
     android.hardware.graphics.allocator@2.0-impl \
+    android.hardware.graphics.composer@2.1-impl \
     android.hardware.graphics.mapper@2.0-impl
 
 # Memtrack