mb/intel/adlrvp: Rework Kconfig

mb/intel/adlrvp: Rework Kconfig

Rework Kconfig file that each variant has its own config option with
their specific selects / configuration and move common selects to
`BOARD_INTEL_ADLRVP_COMMON`, which is used as base for each
variant.

Also, move selects from Kconfig.name to Kconfig that the configuration
is at one place and not distributed over two files.

Built each variant with `BUILD_TIMELESS=1` and all generated
coreboot.rom files remain identical. Excluded the .config file by
disabling `INCLUDE_CONFIG_FILE` to make this reproducible.

Change-Id: If68c118f22579cc0a3db570119798f0f535f9804
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56221
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>