nios2: rename board nios2-generic to 3c120_devboard

nios2: rename board nios2-generic to 3c120_devboard

Rename board nios2-generic to 3c120_devboard. Since nios2 is
converted to driver model and device tree control of u-boot,
the nios2-generic board directory is removed. We can rename
the board back to a real board name. Now the boards maintained
in u-boot mainline are the same as Linux kernel, namely 3c120
and 10m50.

Signed-off-by: Thomas Chou <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Acked-by: Marek Vasut <[email protected]>