scripts: ci: check_compliance: Inline creation of HWMv2 temp dirs

The KCONFIG_BINARY_DIR/{boards,soc,arch}/ directories are only relevant
for `KconfigCheck.get_v2_model()`, so generate them within this method.

Signed-off-by: Grzegorz Swiderski <grzegorz.swiderski@nordicsemi.no>