Added alarm functions (read and set)

Signed-off-by: Liam Beguin <lvb@xiphos.ca>
Signed-off-by: Joshua Lamorie <joshua.lamorie@xiphos.com>
Added sysfs to be able to read rtc temperature

Signed-off-by: Liam Beguin <lvb@xiphos.ca>
Signed-off-by: Joshua Lamorie <joshua.lamorie@xiphos.com>