[material-ui] Adds missing subtitleStyleProps to GridTile (#18271)

* Adds props to GridTile

* Removes the children prop that I added

types/material-ui/index.d.ts

@@ -1055,6 +1055,7 @@ declare namespace __MaterialUI {
             rows?: number;
             style?: React.CSSProperties;
             subtitle?: React.ReactNode;
+            subtitleStyle?: React.CSSProperties;
             title?: React.ReactNode;
             titleBackground?: string;
             titlePosition?: "top" | "bottom";