mb/google/poppy/variants/nami: Perform PL2 setting in variant_devtree_udpate

This change moves PL2 override to variant_devtree_update for two reasons:
1. This function was added to basically override devtree settings in
variant specific code. So, it would be a good idea to perform all the
overrides in a single place.
2. Adding a device for performing nami_enable would require changes to
devicetree and special handling for calling this device enable. Thus,
nami_enable was never getting called.

BUG=b:80148703

Change-Id: Ifa24a7b6e99cad2368b3d656a757f26297373121
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/26499
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3 files changed