sh-pfc: r8a7790: add HSCIF pin groups

Adds HSCIF data/clk/ctrl groups to R8A7790 PFC driver.

Signed-off-by: Ulrich Hecht <ulrich.hecht@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>