use specific resolution for bootanimation

the original idea came from this patch
CyanogenMod/android_vendor_cm@367e648

-use SMALL_BOOTANIMATION_SIZE instead of TARGET_BOOTANIMATION_SIZE to avoid any issues with devices that may still contain cm leftovers

Change-Id: Iefe4d59d66930a75e2c15baf31a4412db110871b
Signed-off-by: Humberto Borba <humberos@gmail.com>

config/common.mk

@@ -82,9 +82,14 @@ include vendor/du/config/packages.mk
 
 PRODUCT_PACKAGE_OVERLAYS += vendor/du/overlay/common
 
-# Boot Animation
+# use specific resolution for bootanimation
+ifneq ($(SMALL_BOOTANIMATION_SIZE),)
+PRODUCT_COPY_FILES += \
+    vendor/du/prebuilt/common/media/res/$(SMALL_BOOTANIMATION_SIZE).zip:system/media/bootanimation.zip
+else
 PRODUCT_COPY_FILES += \
     vendor/du/prebuilt/common/media/bootanimation.zip:system/media/bootanimation.zip
+endif
 
 # SuperSU
 PRODUCT_COPY_FILES += \