Add wakeup support for rtc-efi, so we can wakeup from S3/S4/S5 through
rtcwake.
Signed-off-by: Riwen Lu <luriwen@kylinos.cn>
Link: https://lore.kernel.org/r/TYWP286MB260191455377CEBD2336557EB1659@TYWP286MB2601.JPNP286.PROD.OUTLOOK.COMSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>