nb/intel/i945: Use boolean for gpu_lvds_use_spread_spectrum_clock

Change-Id: I5f11bde99dfcde81c9dc62c1102330c0a6c16e04
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70149
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/northbridge/intel/i945/chip.h

@@ -4,6 +4,7 @@
 #define NORTHBRIDGE_INTEL_I945_CHIP_H
 
 #include <drivers/intel/gma/i915.h>
+#include <types.h>
 
 struct northbridge_intel_i945_config {
 	/* In units of 100us timer */
@@ -17,7 +18,7 @@ struct northbridge_intel_i945_config {
 
 	u32 gpu_hotplug;
 	u32 pwm_freq;
-	int gpu_lvds_use_spread_spectrum_clock;
+	bool gpu_lvds_use_spread_spectrum_clock;
 	struct i915_gpu_controller_info gfx;
 	int pci_mmio_size;
 };