drm/i915: Limit max VCO supported in CHV to 6.48GHz

As per the recommendation from PHY team, limit the max vco supported in CHV to 6.48 GHz
Signed-off-by: NVijay Purushothaman <vijay.a.purushothaman@linux.intel.com>
Acked-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -390,7 +390,7 @@ static const intel_limit_t intel_limits_chv = {
 	 * them would make no difference.
 	 */
 	.dot = { .min = 25000 * 5, .max = 540000 * 5},
-	.vco = { .min = 4860000, .max = 6700000 },
+	.vco = { .min = 4860000, .max = 6480000 },
 	.n = { .min = 1, .max = 1 },
 	.m1 = { .min = 2, .max = 2 },
 	.m2 = { .min = 24 << 22, .max = 175 << 22 },