soc/intel: Use config_of()

Change-Id: I0727a6b327410197cf32f598d1312737744386b3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34328
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: David Guckian

src/soc/intel/skylake/graphics.c

@@ -36,7 +36,7 @@ uintptr_t fsp_soc_get_igd_bar(void)
 
 static void graphics_setup_panel(struct device *dev)
 {
-	struct soc_intel_skylake_config *conf = dev->chip_info;
+	struct soc_intel_skylake_config *conf = config_of(dev);
 	struct resource *mmio_res;
 	uint8_t *base;
 	u32 reg32;