Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/amcc/taihu/taihu.c b/board/amcc/taihu/taihu.c
index a98c186..5224378 100644
--- a/board/amcc/taihu/taihu.c
+++ b/board/amcc/taihu/taihu.c
@@ -93,7 +93,7 @@
 
 U_BOOT_CMD (
 	sw2_stat, 1, 1, do_sw_stat,
-	"sw2_stat - show status of switch 2\n",
+	"show status of switch 2",
 	NULL
 	);
 
@@ -132,7 +132,7 @@
 
 U_BOOT_CMD (
 	led_ctl, 3, 1, do_led_ctl,
-	"led_ctl	- make led 1 or 2  on or off\n",
+	"make led 1 or 2  on or off",
 	"<led_no> <on/off>	-  make led <led_no> on/off,\n"
 	"\tled_no is 1 or 2\t"
 	);