rtc: k3: handle errors while enabling wake irq

rtc: k3: handle errors while enabling wake irq

[ Upstream commit d31d7300ebc0c43021ec48c0e6a3a427386f4617 ]

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

Fixes: 3c7b949e32bc ("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.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>