superio: Replace the indexed I/O functions

Replace the multiple indexed I/O read and write
functions with common functions.

Change-Id: Idfe7a8784c28d51b3fbcb2f4e26beaa0b91741a8
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/10145
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
7 files changed