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/freescale/mpc8610hpcd/mpc8610hpcd_diu.c b/board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c
index 2320c0f..2b2d5d7 100644
--- a/board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c
+++ b/board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c
@@ -138,7 +138,7 @@
 
 U_BOOT_CMD(
 	diufb, CONFIG_SYS_MAXARGS, 1, mpc8610diu_init_show_bmp,
-	"diufb - Init or Display BMP file\n",
+	"Init or Display BMP file",
 	"init\n    - initialize DIU\n"
 	"addr\n    - display bmp at address 'addr'\n"
 	);