board/BuR/kwb: use bootvx(...) (with bootline feature) instead go(...)

Since we don't have for sure a valid IP-setup during
board_late_init(...) because it maybe allready stored in environment or
not, we cannot form a proper vxWorks bootline at this place.

So we move to the way, forming the bootline just before
executing/launching vxWorks. To do this we use the bootvx command
instead go.

We only have to form the "othbootargs" environment variable, the rest is
done pretty good by the "bootvx" commannd.

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/kwb_defconfig b/configs/kwb_defconfig
index f82fcf3..0bbe0a7 100644
--- a/configs/kwb_defconfig
+++ b/configs/kwb_defconfig
@@ -3,6 +3,9 @@
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1"
 CONFIG_SYS_PROMPT="U-Boot (BuR V2.0)# "
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_BOOTM is not set
+# CONFIG_CMD_GO is not set
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_XIMG is not set