Refactor some names

Additionally:
- Do not retry to init sd if all modes failed in Nyx.
- Do not try to read/write if sdmmc controller and card are not initialized.

nyx/nyx_gui/nyx.c

@@ -307,7 +307,7 @@ static void _show_errors()
 		switch (*excp_type)
 		{
 		case EXCP_TYPE_RESET:
-			WPRINTF("RST");
+			WPRINTF("RESET");
 			break;
 		case EXCP_TYPE_UNDEF:
 			WPRINTF("UNDEF");