ARM: dts: r8a7790: Remove obsolete vsp1 properties

As of commit 5aa2eb3c

 ("[media] v4l: vsp1: Configure device
based on IP version"), the DT properties to identify the exact VSP
device instance features are no longer used. Hence remove them.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>