drm/i915: Show dmc debug registers on Kabylake

The assumption is that the registers offsets are
identical as with skl. Also all the published
kbl firmwares support the debug registers. So
let kbl show the debug counts.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100975
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1494324322-28193-1-git-send-email-mika.kuoppala@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2853,7 +2853,8 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
 	seq_printf(m, "version: %d.%d\n", CSR_VERSION_MAJOR(csr->version),
 		   CSR_VERSION_MINOR(csr->version));
 
-	if (IS_SKYLAKE(dev_priv) && csr->version >= CSR_VERSION(1, 6)) {
+	if (IS_KABYLAKE(dev_priv) ||
+	    (IS_SKYLAKE(dev_priv) && csr->version >= CSR_VERSION(1, 6))) {
 		seq_printf(m, "DC3 -> DC5 count: %d\n",
 			   I915_READ(SKL_CSR_DC3_DC5_COUNT));
 		seq_printf(m, "DC5 -> DC6 count: %d\n",