nios2: change README.nios2 to use 10m50 as template

The 10m50 devboard becomes the new golden reference design of
Nios II Linux. So change README.nios2 to use 10m50 as template.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Marek Vasut <marex@denx.de>
1 file changed