Clean up diufb command definitions

The diufb command usage formatting is non-standard.  It was
made standard in preparation for larger command usage updates.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

board/ads5121/ads5121_diu.c

diff --git a/board/ads5121/ads5121_diu.c b/board/ads5121/ads5121_diu.c
index 11450aa..896900b 100644
--- a/board/ads5121/ads5121_diu.c
+++ b/board/ads5121/ads5121_diu.c
@@ -101,7 +101,7 @@
 
 U_BOOT_CMD(
 	diufb, CONFIG_SYS_MAXARGS, 1, ads5121diu_init_show_bmp,
-	"diufb init | addr - Init or Display BMP file\n",
+	"diufb - Init or Display BMP file\n",
 	"init\n    - initialize DIU\n"
 	"addr\n    - display bmp at address 'addr'\n"
 	);

board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c

diff --git a/board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c b/board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c
index cd25d4a..08eaf10 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 | addr - Init or Display BMP file\n",
+	"diufb - Init or Display BMP file\n",
 	"init\n    - initialize DIU\n"
 	"addr\n    - display bmp at address 'addr'\n"
 	);