OTA: Change the soft link of '/sdcard' && '/external_sd'
 If we not inject '/external_sd'
 '/sdcard' will soft link to '/storage/sdcard0'

 If inject '/external_sd', we need to change the soft link
 '/sdcard' -> '/storage/sdcard1'
 '/external_sd' -> '/storage/sdcard0'

Signed-off-by: sndnvaps <sndnvaps@gmail.com>