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/drivers/qe/qe.c b/drivers/qe/qe.c
index 7b29fd7..e90a4a5 100644
--- a/drivers/qe/qe.c
+++ b/drivers/qe/qe.c
@@ -461,7 +461,7 @@
 
 U_BOOT_CMD(
 	qe, 4, 0, qe_cmd,
-	"qe      - QUICC Engine commands\n",
+	"QUICC Engine commands",
 	"fw <addr> [<length>] - Upload firmware binary at address <addr> to "
 		"the QE,\n\twith optional length <length> verification.\n"
 	);