ARM64: dts: marvell: cn9310-crb: Remove duplicate pinctrl

The cn9130.dtsi defines a pinctrl node for SPI1 (until recently it was
mislabeled as spi0). Use this instead of having a duplicate definition
with a different label.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>