mb/google/fatcat: Create felino variant

mb/google/fatcat: Create felino variant

Create the felino variant of the fatcat reference board by copying
the fatcat files to a new directory named for the variant.

BUG=b:379797598
TEST=1. util/abuild/abuild -p none -t google/fatcat -x -a
        make sure the build includes GOOGLE_FELINO
     2. Run part_id_gen tool without any errors

Change-Id: Iff7989c19e775d65d5fb04aa4489854150390a35
Signed-off-by: Tongtong Pan <pantongtong@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85185
Reviewed-by: Weimin Wu <wuweimin@huaqin.corp-partner.google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>