soc/amd/common/lpc: Add SuperIO decode function
The LPC-ISA bridge supports two ranges for SuperIO control registers.
Add a generic function to allow a mainboard to enable the appropriate
range. Provide #define values that are more descriptive than the
register's field names.
Change-Id: Ic5445cfc137604cb1bb3ee3ea4c3a4ebdb9a9cab
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35271
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>