arm64: dts: imx8mq-librem5: improve camera node names
remove the unused label for the rear cam and name the nodes themselves "front" and "rear".
Closes https://source.puri.sm/Librem5/linux-next/-/issues/335
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remove the unused label for the rear cam and name the nodes themselves "front" and "rear".
Closes https://source.puri.sm/Librem5/linux-next/-/issues/335