mako: Set TARGET_BOOTANIMATION_HALF_RES to true

* No apparent resolution difference
* Much smoother animation
* Much faster boot
* What's not to like?

Change-Id: I2119fe826146a3103da50b4862ad88f5950a97ec

lineage.mk

 # Boot animation
 TARGET_SCREEN_HEIGHT := 1280
 TARGET_SCREEN_WIDTH := 768
+TARGET_BOOTANIMATION_HALF_RES := true
 
 # Inherit some common Lineage stuff.
 $(call inherit-product, vendor/lineage/config/common_mini_phone.mk)