scripts: ci: check_compliance: Remove HWMv1 dead code

HWMv1-specific Kconfig checks were meant to be removed before HWMv2 was
merged into `main` (see `collab-hwm` history), but some traces remained.
Do another round of cleanup.

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