riscv: add missing linefeed in error message

* Messages written with log_err() should be terminated with linefeed.
* Spell device-tree with hyphen as elsewhere in U-Boot.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
1 file changed