superio: move files to match the common naming scheme

Change-Id: I1a8fc34aaaf42514c8af97ab155ff2712e7a5448
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/23009
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
6 files changed