ALSA: hda/tas2781: Use standard clamp() macro

Instead of the home-made clamp() function, use the standard macro().

Fixes: 5be27f1e ("ALSA: hda/tas2781: Add tas2781 HDA driver")
Link: https://lore.kernel.org/r/20230831123620.23064-1-tiwai@suse.de


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