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/lwmon5/lwmon5.c b/board/lwmon5/lwmon5.c
index adecad0..4c04b98 100644
--- a/board/lwmon5/lwmon5.c
+++ b/board/lwmon5/lwmon5.c
@@ -486,7 +486,7 @@
 
 U_BOOT_CMD(
 	eepromwp,	2,	0,	do_eeprom_wp,
-	"eepromwp- eeprom write protect off/on\n",
+	"eeprom write protect off/on",
 	"<on|off> - enable (on) or disable (off) I2C EEPROM write protect\n"
 );