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/amcc/taishan/update.c b/board/amcc/taishan/update.c
index 96b918b..63f8744 100644
--- a/board/amcc/taishan/update.c
+++ b/board/amcc/taishan/update.c
@@ -74,5 +74,5 @@
 }
 
 U_BOOT_CMD(update_boot_eeprom, 1, 1, do_update_boot_eeprom,
-	   "update_boot_eeprom  - update bootstrap eeprom content\n", NULL);
+	   "update bootstrap eeprom content", NULL);
 #endif