mb/google/slippy: Convert variants to use override devicetree

Since the variants' devicetrees are almost identical, convert to
using an overridetree setup for simplicity.

Test: build all slippy variants, compare generated static.c to ensure
resulting generated contents unchanged (although layout will)

Change-Id: If237fad38a1bccfb8e51edfae3ecb75d05ade240
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39919
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions