drm/i915: Fix readout for cnl DPLL kdiv==3

The readout code thinks that kdiv of 3 is 4. Fix it.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190207173230.22368-11-ville.syrjala@linux.intel.comReviewed-by: NLucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/i915/i915_reg.h

@@ -9850,7 +9850,7 @@ enum skl_power_gate {
 #define  DPLL_CFGCR1_KDIV(x)		((x) << 6)
 #define  DPLL_CFGCR1_KDIV_1		(1 << 6)
 #define  DPLL_CFGCR1_KDIV_2		(2 << 6)
-#define  DPLL_CFGCR1_KDIV_4		(4 << 6)
+#define  DPLL_CFGCR1_KDIV_3		(4 << 6)
 #define  DPLL_CFGCR1_PDIV_MASK		(0xf << 2)
 #define  DPLL_CFGCR1_PDIV_SHIFT		(2)
 #define  DPLL_CFGCR1_PDIV(x)		((x) << 2)

drivers/gpu/drm/i915/intel_ddi.c

@@ -1349,8 +1349,8 @@ int cnl_calc_wrpll_link(struct drm_i915_private *dev_priv,
 	case DPLL_CFGCR1_KDIV_2:
 		p2 = 2;
 		break;
-	case DPLL_CFGCR1_KDIV_4:
-		p2 = 4;
+	case DPLL_CFGCR1_KDIV_3:
+		p2 = 3;
 		break;
 	}