Add /dev/rtc backend to SystemClock
Add /dev/rtc backend to SystemClock

On devices without /dev/alarm, use the settimeofday() syscall and the
standard RTC_SET_TIME ioctl (which are collectively equivalent to the
ANDROID_ALARM_SET_RTC ioctl).

Change-Id: I3c1d741099e253186e43c9369b62603b214b9c9a
Signed-off-by: Greg Hackmann <e4b32643abc22f0015f12596bd9b0c46cec422aa@google.com>

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base