bootanimation.zip contains PNG files and not JPG
Some zips aren't resized and use original resolution instead half resolution,
fix it too.
Change-Id: Ic12f93dc2a18f7ca9c9c7bff6b34dc0821bbfb4c
On low-end devices, the current 48 fps boot animation can use more than
50% of CPU time, and if the texture cache is enabled, a majority of main
memory as well. For these devices, add half-resolution variants of the
lower-resolution boot animations which display 2x upscaled -- this
greatly speeds the boot process and makes the boot animation run more
smoothly.
Change-Id: I0140616ca38c52a06dd4622f1c20a9ca0da95f4b
