soc: riscv: intel_niosv: move and convert to HWMv2

Move to HWMv2 and convert from soc/riscv/intel_niosv SoC family
`INTEL_NIOSV` series `NIOSV` SoCs `NIOSV_M` and `NIOSV_G`.

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