fbdev/viafb: Do not include <linux/export.h>

Fix the compile-time warning

  drivers/video/fbdev/via/via-gpio.c: warning: EXPORT_SYMBOL() is not used, but #include <linux/export.h> is present

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Helge Deller <deller@gmx.de>
Fixes: 7d95680 ("scripts/misc-check: check unnecessary #include <linux/export.h> when W=1")
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20250612081738.197826-15-tzimmermann@suse.de

Author: tdz

drivers/video/fbdev/via/via-gpio.c

@@ -10,7 +10,6 @@
 #include <linux/gpio/machine.h>
 #include <linux/platform_device.h>
 #include <linux/via-core.h>
-#include <linux/export.h>
 #include "via-gpio.h"
 
 /*