ASoC: tas5805m: add missing page switch.

In tas5805m_refresh, we switch pages to update the DSP volume control,
but we need to switch back to page 0 before trying to alter the
soft-mute control. This latter page-switch was missing.

Fixes: ec45268467f4 ("ASoC: add support for TAS5805M digital amplifier")
Signed-off-by: Daniel Beer <[e-mail]>
Link: https://lore.kernel.org/r/1fe[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/tas5805m.c

···
 	set_dsp_scale(rm, 0x24, tas5805m->vol[0]);
 	set_dsp_scale(rm, 0x28, tas5805m->vol[1]);
 
+	regmap_write(rm, REG_PAGE, 0x00);
+	regmap_write(rm, REG_BOOK, 0x00);
+
 	/* Set/clear digital soft-mute */
 	regmap_write(rm, REG_DEVICE_CTRL_2,
 		(tas5805m->is_muted ? DCTRL2_MUTE : 0) |