dt/bindings: Fix binding examples for Tegra GMI controller

Fix devicetree binding examples for the Generic Memory Interface (GMI)
bus driver found on Tegra SOCs.

While at it also remove double new lines as a left over from Rob's
commit 4da722ca ("dt-bindings: Remove "status" from examples").

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>