dt-bindings: drm: bridge: adv7511: Add ADV7535 support

ADV7535 is a part compatible with ADV7533 but it supports 1080p@60hz and
v1p2 supply is fixed to 1.8V

Signed-off-by: Bogdan Togorean <bogdan.togorean@analog.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200121082719.27972-4-bogdan.togorean@analog.com