lge_touch_core: fix i2c error after firmware upgrade

After firmware upgrade, there should be some delay to
prevent i2c error. Added booting_delay to avoid the i2c error.

Change-Id: Icbc9c656d2f7db1329e83553cc5c1e20033600e5
Signed-off-by: Jongrak Kwon <jongrak.kwon@lge.com>