ARM: dts: BCM5301X: Drop invalid properties from Meraki MR32 keys

ARM: dts: BCM5301X: Drop invalid properties from Meraki MR32 keys

This fixes:
arch/arm/boot/dts/bcm53015-meraki-mr26.dtb: keys: '#address-cells', '#size-cells' do not match any of the regexes: '^(button|event|key|switch|(button|event|key|switch)-[a-z0-9-]+|[a-z0-9-]+-(button|event|key|switch))$', 'pinctrl-[0-9]+'
        From schema: Documentation/devicetree/bindings/input/gpio-keys.yaml

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20230602133455.7441-2-zajec5@gmail.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>