riscv: dts: microchip: fix gpio1 reg property typo

Fix reg address typo in the gpio1 stanza.

Signed-off-by: Conor Paxton <conor.paxton@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Fixes: 528a5b1f ("riscv: dts: microchip: add new peripherals to icicle kit device tree")
Link: https://lore.kernel.org/r/20220517104058.2004734f

-1-conor.paxton@microchip.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>