Add TW_NO_SCREEN_BLANK := true
Use rgb565 framebuffer format

* A bit faster, since recovery has to copy half the amount of data
Use prebuilt kernel compressed with XZ (saves 2MB)

* CM kernel at cm-10.2 cb7e7dea306c0623ffac131f46d48473e6581b36
  with CONFIG_KERNEL_XZ=y