Reimplement epdblk

• fixed segfault if not pass first argument
• initial support Rockchip EBC

NDK_PROJECT_PATH=. ndk-build NDK_APPLICATION_MK=./Application.mk

copy epdblk to /system/bin/ and give execute perm then call

epdblk 10

if you need forceful full refresh, call it

epdblk 10 1