x86/platform/olpc-xo1-sci: Don't include <linux/pm_wakeup.h> directly

The header clearly states that it does not want to be included directly,
only via <linux/(platform_)?device.h>. Which is already present, so
delete the superfluous include.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250210113453.51825-2-wsa+renesas@sang-engineering.com