pinctrl: amd: Fix hibernation support with CONFIG_SUSPEND unset

After recent changes, pinctrl-amd will not support hibernation when
CONFIG_HIBERNATION is set and CONFIG_SUSPEND isn't because it will not
register amd_gpio_pm_ops then.

Address this by restoring dependencies on CONFIG_PM_SLEEP where
necessary for hibernation support.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/5889368.DvuYhMxLoT@rjwysocki.net