ALSA: hda/tas2781: Fix incorrect bit update for non-book-zero or book 0 pages >1

ALSA: hda/tas2781: Fix incorrect bit update for non-book-zero or book 0 pages >1

In TAS2781 SPI mode, when accessing non-book-zero or page numbers greater
than 1 in book 0, an additional byte must be read. The first byte in such
cases is a dummy byte and should be ignored.

Fixes: 9fa6a693ad8d ("ALSA: hda/tas2781: Remove tas2781_spi_fwlib.c and leverage SND_SOC_TAS2781_FMWLIB")
Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://patch.msgid.link/20260429054206.429-1-shenghao-ding@ti.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>