dt-bindings: gpio: convert Atmel GPIO to json-schema

Convert the Atmel GPIO controller binding document to DT schema format
using json-schema.
The at91 pinctrl driver uses "atmel,at91rm9200-gpio" compatible string
to find the number of active GPIO banks and identify the pinmux nodes.
"atmel,at91sam9x5-gpio" and "microchip,sam9x60-gpio" have additional
registers to handle drive-strength, slew-rate,  pull-down to drive the
pinmux configs.
The new compatible string "microchip,sam9x7-gpio" is added.

Signed-off-by: Manikandan Muralidharan <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>

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