dts: ssp: Add HDA SSP capabilities.

In current implementation the HDAMLI2SL register is represented by
shim2 field in common SSP device tree file. This could be misleading
since the filed is is different location to I2S IP.

Adding separate device for this register following DMIC case.

Signed-off-by: Jaroslaw Stelter <Jaroslaw.Stelter@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>