rtc: brcmstb-waketimer: don't include 'pm_wakeup.h' directly

The header clearly states that it does not want to be included directly,
only via 'device.h'. 'platform_device.h' works equally well. Remove the
direct inclusion.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20241118072917.3853-14-wsa+renesas@sang-engineering.com


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