ARM: dts: at91: Return to boolean properties

Returning back to commit 0dc23d1a
("arm: dts: at91: Fix boolean properties with values") as pinctrl driver no
longer expects an integer value and expects a simple boolean property.

Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/6f06be9e393c02563bc877498c8af75daf3b47f8.1684313910.git.Ryan.Wanner@microchip.com