add custom graphics.c

Change-Id: I253c4b7c66441c13af5fbfc4a5291b101439e617
recovery: enable vsync and turn on backlight

Change-Id: I45cc63da8d88bea087d8e882d8bf87cb2e674da3
use roboto_15x24 as recovery-font

Change-Id: I4366e537a3038e876114be2e7f87963eed20ef3f