pinctrl: at91-pio4: add support for sama7g5 SoC

Add support for sama7g5 pinctrl block, which has 5 PIO banks.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20200917131257.273882-2-eugen.hristev@microchip.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>