Due to the potential failure of enable_irq_wake(), it would be better to
return error if it fails.

Fixes: b09d6335 ("rtc: Introduce ti-k3-rtc")
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/r/20230323085904.957999-1-d-gole@ti.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>