vendor/omni: Add support for low fps boot animation. 

Some devices can not support over 100+ fps, leaving too 
much black screen time during boot. 

To use, add flag 'USE_LOWFPS_BOOTANI := true' to your 
omni_<device>.mk file, ahead of the call to 
vendor/omni/config/common.mk (or common_tablet.mk). 

This was tested on clean builds for tf101 and with flag 
(and this patch) the low fps boot animation was pulled in 
and without the flag the normal boot animation was pulled in. 
Should work for all devices.

Change-Id: I461381093ca5783a074f35bc5b8aa852c5607d2f
diff --git a/config/common.mk b/config/common.mk
index c3d39a3..6750ea8 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -1,8 +1,13 @@
 PRODUCT_BRAND ?= omni
 
-# bootanimation
+# bootanimation (Some devices cant go over 100fps for a bootani)
+ifneq ($(USE_LOWFPS_BOOTANI),true)
 PRODUCT_COPY_FILES += \
     vendor/omni/prebuilt/bootanimation/bootanimation.zip:system/media/bootanimation.zip
+else
+PRODUCT_COPY_FILES += \
+    vendor/omni/prebuilt/bootanimation/lowfps-bootanimation.zip:system/media/bootanimation.zip
+endif
 
 ifeq ($(PRODUCT_GMS_CLIENTID_BASE),)
 PRODUCT_PROPERTY_OVERRIDES += \