ALSA: ymfpci: Use u16 consistently for old_legacy_ctrl

There's no need to switch between unsigned short and u16, especially since
all the functions that end up using old_legacy_ctrl specify u16 anyway.

Signed-off-by: Tasos Sahanidis <tasos@tasossah.com>
Link: https://lore.kernel.org/r/20230329043627.178899-1-tasos@tasossah.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>