gpu: ipu-v3: export ipu_csi_set_downsize

This function will be used by the media drivers and needs to be exported
to allow them to be built as modules.

Reported-by: Russell King <linux@armlinux.org.uk>
Fixes: 867341b95891 ("gpu: ipu-v3: add ipu_csi_set_downsize")
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/ipu-v3/ipu-csi.c

@@ -544,6 +544,7 @@ void ipu_csi_set_downsize(struct ipu_csi *csi, bool horiz, bool vert)
 
 	spin_unlock_irqrestore(&csi->lock, flags);
 }
+EXPORT_SYMBOL_GPL(ipu_csi_set_downsize);
 
 void ipu_csi_set_test_generator(struct ipu_csi *csi, bool active,
 				u32 r_value, u32 g_value, u32 b_value,