mb/google/rex: Create a `rex` model for easier variant integration

This patch creates  a rex model so that other variants developed using
`rex` baseboard are easy to land without duplicating the config
selection.

So far, `rex0` and `rex_ec_ish` are developed using the `rex` model.
The plan is to extend the support for `rex4es` and `rex4es_ec_ish`
variants.

TEST=Able to build and boot google/rex.

Change-Id: Id4e8d1162da93b7266ee1108f870e89b6d884ab9
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76608
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

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