soc/intel_adsp: add intel_adsp_cavs25_tgph board

Add a new board to support Intel Tiger Lake H PCH variant of cAVS2.5.

Move common Kconfig options for cavs25 to soc level. No need to
replicate these for every board.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>