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/common/cmd_sata.c b/common/cmd_sata.c
index 3380768..e849778 100644
--- a/common/cmd_sata.c
+++ b/common/cmd_sata.c
@@ -194,8 +194,8 @@
 
 U_BOOT_CMD(
 	sata, 5, 1, do_sata,
-	"sata	- SATA sub system\n",
-	"init - init SATA sub system\n"
+	"SATA sub system",
+	"sata init - init SATA sub system\n"
 	"sata info - show available SATA devices\n"
 	"sata device [dev] - show or set current device\n"
 	"sata part [dev] - print partition table\n"