snd_soc_msm_2x: Separate config for xt92x (MICBIAS CAPLESS Switch)

xt92x needs different MICBIAS CAPLESS Switch settings than the rest
of the moto_msm8960 family.
In stock snd_soc_msm_2x, the tx device configurations are duplicated
like 'Camcorder Full' / 'Camcorder Full CAP', 'Line' / 'Line CAP',
that differ in the MICBIAS CAPLESS Switch. Most of the moto_msm8960
family is using the CAP configurations.
Wrong MICBIAS CAPLESS Switch setting is known to cause high pitch
hiss (past fix of hiss on xt897 introduced hiss on xt92x).
Therefore the configs need to be separated.

Change-Id: I232a18051496bd9b888fdb6bbcce9309f7084811