rtc: cmos: fix build on non-ACPI platforms

Now that rtc_wake_setup is called outside of cmos_wake_setup, it also need
to be defined on non-ACPI platforms.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20221018203512.2532407-1-alexandre.belloni@bootlin.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>