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/mpl/pip405/cmd_pip405.c b/board/mpl/pip405/cmd_pip405.c
index 945e5c9..ad5e0a1 100644
--- a/board/mpl/pip405/cmd_pip405.c
+++ b/board/mpl/pip405/cmd_pip405.c
@@ -60,7 +60,7 @@
 }
 U_BOOT_CMD(
 	pip405,	6,	1,	do_pip405,
-	"pip405  - PIP405 specific Cmds\n",
+	"PIP405 specific Cmds",
 	"flash mem [SrcAddr] - updates U-Boot with image in memory\n"
 	"pip405 flash floppy [SrcAddr] - updates U-Boot with image from floppy\n"
 	"pip405 flash mps - updates U-Boot with image from MPS\n"