configs: Update config files for multi-zone input bus support

Update audio configuration xml files for three audio input zones
     - Primary input zone -> Mercury
     - Front passenger seat input zone -> A2B1(8CH ADC1&2) (ALL)
     - Rear seat input zone -> A2B2(8CH ADC1&2) (SA81x5)
                               A2B1(8CH ADC1&2) (SA6155)

Change-Id: I6f5fdcef4ab9e77a51edd53562eb09eece9953a9
Signed-off-by: Huicheng Liu <huicliu@codeaurora.org>