dts: intel_adsp_ace30: merge and cleanup ace30 dtsi files

The new ace30 files structure is organized as follows:

intel_adsp_ace30.dtsi - main file for all variants
intel_adsp_ace30_ptl.dtsi - additional file for PTL variant
intel_adsp_ace30_wcl.dtsi - additional file for WCL variant

The main ace30.dtsi file contains most of the fields,
with only the differences specified in the ace30_ptl.dtsi
and ace30_wcl.dtsi files.

Signed-off-by: Adrian Bonislawski <adrian.bonislawski@intel.com>