ARM: dts: BCM5301X: Drop extra NAND controller compatible

ARM: dts: BCM5301X: Drop extra NAND controller compatible

Fix the dtbs_check warning introduced when the brcm,brcmnand fallback
compatible got removed for iProc machines.

Fixes: 4db35366d6dc ("dt-bindings: mtd: brcm,brcmnand: Drop "brcm,brcmnand" compatible for iProc")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: William Zhang <william.zhang@broadcom.com>
Link: https://lore.kernel.org/r/20260204091530.624230-1-miquel.raynal@bootlin.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>