ARM: shmobile: r8a7791: fix "gpio-ranges" props

On R8A7791, GPIO banks 1 and 7  are missing  pins 26 to 31.  Correct the
"gpio-ranges" properties of the GPIO1 node (GPIO7 is already correct).

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>