Revert "[Box] Remove component from TypeMap (mui#38168)"

This reverts commit de38693.

Author: michaldudak

packages/mui-system/src/Box/Box.d.ts

@@ -178,6 +178,11 @@ export interface BoxTypeMap<
   props: AdditionalProps &
     SystemProps<Theme> & {
       children?: React.ReactNode;
+      /**
+       * The component used for the root node.
+       * Either a string to use a HTML element or a component.
+       */
+      component?: React.ElementType;
       ref?: React.Ref<unknown>;
       /**
        * The system prop that allows defining system overrides as well as additional CSS styles.