hammerhead: change permission of /dev/rtc0
hammerhead: change permission of /dev/rtc0

Change permission from root.root to system.system for /dev/rtc0

Change-Id: I1aedc4cbf7e228f157baca0b1540dcad3e811067

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead