auxdisplay: charlcd: Don't rebuild when CONFIG_PANEL_BOOT_MESSAGE=y

When CONFIG_PANEL_BOOT_MESSAGE=y the module still includes
the generated header and gets rebuilt even if it doesn't use
anything from that header.  Include generated header conditionally
to avoid unnecessary rebuilds.
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/auxdisplay/charlcd.c

@@ -17,7 +17,9 @@
 #include <linux/uaccess.h>
 #include <linux/workqueue.h>
 
+#ifndef CONFIG_PANEL_BOOT_MESSAGE
 #include <generated/utsrelease.h>
+#endif
 
 #include "charlcd.h"