ARM: dts: ti: drop linux,mtd-name from NAND nodes

linux,mtd-name is only supported by PHYSMAP driver and not applicable
to NAND controller/flash nodes.

Fixes the below dtbs_check warning on many OMAP boards.

"nand@0,0: Unevaluated properties are not allowed ('linux,mtd-name' was unexpected)"

Signed-off-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20240903-gpmc-dtb-v1-1-380952952e34@kernel.org


Signed-off-by: Kevin Hilman <khilman@baylibre.com>