conf/ucm: bytcr-rt5651: Add bytcr-rt5651-stereo-spk-dmic-mic config

Add a config for boards which use a digital mic as internal mic,
combined with having the headset mic on in2.

An example of such a board is the Point of View TAB-P1006W-232 (v1.0) tablet.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>