soc: boards: xtensa: intel_adsp_cavs25: Rename with HWMv2

Rename for better HWMv2 use:
 SoC - `intel_tgl_adsp` to `cavs25`

Resulting name changes for boards:
 `intel_adsp_cavs25/intel_tgl_adsp`      -> `intel_adsp_cavs25/cavs25`
 `intel_adsp_cavs25/intel_tgl_adsp/tgph` -> `intel_adsp_cavs25/cavs25/tgph`

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>