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/renesas/sh7785lcr/rtl8169_mac.c b/board/renesas/sh7785lcr/rtl8169_mac.c
index 8b04453..6d0bbc0 100644
--- a/board/renesas/sh7785lcr/rtl8169_mac.c
+++ b/board/renesas/sh7785lcr/rtl8169_mac.c
@@ -323,7 +323,7 @@
 
 U_BOOT_CMD(
 	setmac,	2,	1,	do_set_mac,
-	"setmac - write MAC address for RTL8110SCL\n",
+	"write MAC address for RTL8110SCL",
 	"\n"
 	"setmac <mac address> - write MAC address for RTL8110SCL\n"
 );
@@ -342,7 +342,7 @@
 
 U_BOOT_CMD(
 	printmac,	1,	1,	do_print_mac,
-	"printmac - print MAC address for RTL8110\n",
+	"print MAC address for RTL8110",
 	"\n"
 	"    - print MAC address for RTL8110\n"
 );