asoc: codec: make mclk freq configurable in Bolero

Add support to make mclk freq configurable in Bolero
Macros - VA, TX and RX. Fallback to 9.6MHz if mclk
frequency is not defined in DTSI.

Change-Id: I27034d6bd31e1ed225adfc8de1b43cd68da84db3
Signed-off-by: Abhilash Sathyanarayana <quic_abhisath@quicinc.com>