toradex: drop legacy show_boot_logo function and use splashscreen

Drop show_boot_logo legacy function, as splashscreen functionality can
be used instead.

Fixes: d324189772("toradex: common: show boot logo")
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
diff --git a/board/toradex/common/tdx-common.c b/board/toradex/common/tdx-common.c
index fe5295f..a3d287e 100644
--- a/board/toradex/common/tdx-common.c
+++ b/board/toradex/common/tdx-common.c
@@ -203,22 +203,3 @@
 }
 
 #endif /* CONFIG_TDX_CFG_BLOCK */
-
-#if defined(CONFIG_DM_VIDEO)
-int show_boot_logo(void)
-{
-	struct udevice *dev;
-	int ret;
-	int xpos, ypos;
-
-	splash_get_pos(&xpos, &ypos);
-
-	ret = uclass_get_device(UCLASS_VIDEO, 0, &dev);
-	if (ret)
-		return ret;
-
-	ret = video_bmp_display(dev, (ulong)bmp_logo_bitmap, xpos, ypos, true);
-
-	return ret;
-}
-#endif /* CONFIG_DM_VIDEO */