dt-bindings: phy: tegra-xusb: Convert to json-schema

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2186348

commit fb1ff01
Author: Thierry Reding <treding@nvidia.com>
Date: Fri, 13 Jan 2023 16:08:04 +0100

    Convert the Tegra XUSB pad controller bindings from free-form text
    format to json-schema.

    Signed-off-by: Thierry Reding <treding@nvidia.com>
    Link: https://lore.kernel.org/r/20230113150804.1272555-1-thierry.reding@gmail.com
    Signed-off-by: Vinod Koul <vkoul@kernel.org>

Signed-off-by: Mark Salter <msalter@redhat.com>

Author: mosalter