intel_adsp: add a header for soc specific defines

Instead of ifdeffing on SOCs and missing things along the way, maintain
platform definitions that are different among SoCs in one single file
per SoC and use data from that file critical spots.

In this case, we were checking for CAVS25, setting one value where
everything else was set to 0, so new SoC like ACE was getting 0 as well,
although it has the same value as TGL.

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