drm/i915: Add support for Kabylake to function obtaining shared PLL

This adds support for KBL in the new function added in commit ID:
commit <f169660ed4e57a03e6f6ed07fe192dbcb7687a0d> that returns a
shared pll in case of DDI platforms.

Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473728663-14355-1-git-send-email-manasi.d.navare@intel.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -2424,7 +2424,7 @@ intel_ddi_get_link_dpll(struct intel_dp *intel_dp, int clock)
 			pll->config = tmp_pll_config;
 			return NULL;
 		}
-	} else if (IS_SKYLAKE(dev_priv)) {
+	} else if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
 		pll = skl_find_link_pll(dev_priv, clock);
 	} else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
 		pll = hsw_ddi_dp_get_dpll(encoder, clock);