hikey: Enable drm_hwcomposer on 4.9 kernels

Enable drm_hwcomposer on hikey for 4.9 kernels

Note: This patch will have to be merged in lockstep
with a prebuilt kernel update that includes the following
commits:
https://android-review.googlesource.com/c/kernel/hikey-linaro/+/748309

Change-Id: I85644529527c37048dec6d38f159e5adf09ccef2
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/hikey-common.mk b/hikey-common.mk
index 5dca9d5..86909f1 100644
--- a/hikey-common.mk
+++ b/hikey-common.mk
@@ -27,11 +27,7 @@
     HIKEY_USE_LEGACY_TI_BLUETOOTH := true
   else
     HIKEY_USE_LEGACY_TI_BLUETOOTH := false
-    ifeq ($(TARGET_KERNEL_USE), 4.9)
-      HIKEY_USE_DRM_HWCOMPOSER := false
-    else
-      HIKEY_USE_DRM_HWCOMPOSER := true
-    endif
+    HIKEY_USE_DRM_HWCOMPOSER := true
   endif
   TARGET_FSTAB := fstab.hikey
 endif