Stub display_present

R=gkalsi@google.com

Review URL: https://codereview.chromium.org/1951403002 .

target/qemu-m4/m4display.c

@@ -230,3 +230,10 @@ status_t display_get_info(struct display_info *info)
 
     return NO_ERROR;
 }
+
+status_t display_present(struct display_image *image, uint starty, uint endy)
+{
+  TRACEF("display_present - not implemented");
+  DEBUG_ASSERT(false);
+  return NO_ERROR;
+}