pinctrl: sh-pfc: pfc-r8a7790: Add missing VIN1 pins

Both VIN0 and VIN1 channels support identical input interfaces.
Add missing VIN1 pins here and organize them in the same pin
groups as VIN0.

Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>