bytcr-rt5640: Add support for devices without speakers and/or an internal mic

bytcr-rt5640: Add support for devices without speakers and/or an internal mic

There are kernel patches pending upstream for the bytcr-rt5640 machine-driver
to support devices without speakers and/or an internal mic.

Since the UCM profile already conditionally loads the speaker and
internal-mic codec include files, these will simply get skipped in this
case, so this almost works with the current UCM profile without changes.

The only troublesome part is the ConflictingDevice sections in the codec
HeadPhones.conf and HeadsetMic.conf files, which refer to resp. a "Speaker"
and a "Mic" device. Without any of the speaker or mic codec conf files
being included there will not by any "Speaker" / "Mic" devices leading
to an error while parsing the HeadPhones.conf / HeadsetMic.conf files.

This commit makes the ConflictingDevice section conditional, fixing this.

Cc: Rasmus Porsager <rasmus@beat.dk>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>