dt-bindings: pinctrl: sunxi: Allow pinctrl with more interrupt banks

Recently introduced Allwinner A100 pinctrl block has 7 interrupts.

This trig a warning when running dtb_checks:
sun50i-a100-allwinner-perf1.dt.yaml: pinctrl@300b000: interrupts: [...] is too long
	From schema: .../allwinner,sun4i-a10-pinctrl.yaml

Fix this by allowing up to 7 interrupts.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201005190939.21016-1-peron.clem@gmail.com


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