ALSA: hda/tas2781: correct the register for pow calibrated data

Calibrated data was written into an incorrect register, which cause
speaker protection sometimes malfuctions

Fixes: 5be27f1e

 ("ALSA: hda/tas2781: Add tas2781 HDA driver")
Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Cc: <stable@vger.kernel.org>
Message-ID: <20240406132010.341-1-shenghao-ding@ti.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>