MIPS: Netlogic: Fix DT flash size parameter

The flash chipselects can span 32MB, fix this in the built-in device
tree.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5704/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>