This patch adds support for the WR841N v12. For TFTP recovery, the
image name has to be wr841nv11_tp_recovery.bin (with 11, not 12)!

Signed-off-by: Adrian Schmutzler <[email protected]>
Tested-by: Adrian Schmutzler <[email protected]>
Reviewed-by: Tobias Klaus <[email protected]>