board: edgeble: Fix neural-compute-module-2 board name

The board should be RV1126-NEU2 instead RV1126-ECM0.

Fix the wrong name.

Fixes: b8f1ca95 ("board: rockchip: Add Edgeble Neu2 IO Board")
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>