cmd: Make use of U_BOOT_LONGHELP when missing

After adding the U_BOOT_LONGHELP macro some new commands came in still
that were not making use if it. Switch these cases over and in a few
places add missing newlines as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-imx/cmd_dek.c b/arch/arm/mach-imx/cmd_dek.c
index c7962ea..56e1a8f 100644
--- a/arch/arm/mach-imx/cmd_dek.c
+++ b/arch/arm/mach-imx/cmd_dek.c
@@ -395,10 +395,10 @@
 }
 
 /***************************************************/
-static char dek_blob_help_text[] =
+U_BOOT_LONGHELP(dek_blob,
 	"src dst len            - Encapsulate and create blob of data\n"
 	"                         $len bits long at address $src and\n"
-	"                         store the result at address $dst.\n";
+	"                         store the result at address $dst.\n");
 
 U_BOOT_CMD(
 	dek_blob, 4, 1, do_dek_blob,