m68k: powerpc: Clean up do_mdm_init

This code seems unnecessarily complex. We really just need to check the
global_data. Now that is it all in one place, and not arch-specific, this
is pretty easy.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/m68k/lib/board.c

@@ -628,13 +628,6 @@ void board_init_r (gd_t *id, ulong dest_addr)
 	}
 #endif
 
-#ifdef CONFIG_MODEM_SUPPORT
- {
-	 extern int do_mdm_init;
-	 do_mdm_init = gd->do_mdm_init;
- }
-#endif
-
 #ifdef CONFIG_WATCHDOG
 	/* disable watchdog if environment is set */
 	if ((s = getenv ("watchdog")) != NULL) {

arch/powerpc/lib/board.c

@@ -991,14 +991,6 @@ void board_init_r(gd_t *id, ulong dest_addr)
 	kbd_init();
 #endif
 
-#ifdef CONFIG_MODEM_SUPPORT
-	{
-		extern int do_mdm_init;
-
-		do_mdm_init = gd->do_mdm_init;
-	}
-#endif
-
 	/* Initialization complete - start the monitor */
 
 	/* main_loop() can return to retry autoboot, if so just run it again. */