ALSA: oxygen: Fix dependency on CONFIG_PM_SLEEP

ALSA: oxygen: Fix dependency on CONFIG_PM_SLEEP

The conversion to EXPORT_SIMPLE_DEV_PM_OPS() also replaced the pm ops
assignment with pm_ptr() macro, but this made difference from the
original code; it  had conditional with ifdef CONFIG_PM_SLEEP, while
we have now with CONFIG_PM, instead.  This seems causing build errors
with randomconfig.

For fixing the inconsistency, replace pm_ptr() with pm_sleep_ptr().

Fixes: 5ea0a2206b58 ("ALSA: oxygen: Convert to EXPORT_SIMPLE_DEV_PM_OPS()")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503201853.7kB0BPRw-lkp@intel.com/
Link: https://patch.msgid.link/20250320105721.10789-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>