disp: msm: add support for splitlink in sde drm

Change adds support for splitlink and disables
dsc merge or 3dmerge which is not needed for splitlink.

Change-Id: I77a794d3ea6f53988f493a7af792add81abb22f0
Signed-off-by: Vara Reddy <varar@codeaurora.org>

msm/sde/sde_hw_intf.c

@@ -464,12 +464,13 @@ static void sde_hw_intf_bind_pingpong_blk(
 	c = &intf->hw;
 
 	mux_cfg = SDE_REG_READ(c, INTF_MUX);
-	mux_cfg &= ~0xf;
+	mux_cfg &= ~0xf000f;
 
 	if (enable) {
 		mux_cfg |= (pp - PINGPONG_0) & 0x7;
+		/* Splitlink case, pp0->sublink0, pp1->sublink1 */
 		if (intf->cfg.split_link_en)
-			mux_cfg = 0x60000;
+			mux_cfg = 0x10000;
 	} else {
 		mux_cfg = 0xf000f;
 	}