drm/vc4: change vc4_dma_range_matches from a global to static

sparse reports
drivers/gpu/drm/vc4/vc4_drv.c:270:27: warning: symbol 'vc4_dma_range_matches' was not declared. Should it be static?

vc4_dma_range_matches is only used in vc4_drv.c, so it's storage class specifier
should be static.

Fixes: da8e393e ("drm/vc4: drv: Adopt the dma configuration from the HVS or V3D component")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220629200101.498138-1-trix@redhat.com

drivers/gpu/drm/vc4/vc4_drv.c

@@ -209,7 +209,7 @@ static void vc4_match_add_drivers(struct device *dev,
 	}
 }
 
-const struct of_device_id vc4_dma_range_matches[] = {
+static const struct of_device_id vc4_dma_range_matches[] = {
 	{ .compatible = "brcm,bcm2711-hvs" },
 	{ .compatible = "brcm,bcm2835-hvs" },
 	{ .compatible = "brcm,bcm2835-v3d" },