hwc: Add target specific checks in hwcomposer

* Mdss driver supports DMA-Multiplexing on wb interface
for certain targets. Add overlay get function to query
this info during pipe allocation for wb.

* UI Scaling on external is not supported on certain
targets due to the lack of availability of pipes with
scalars. Add overlay get function to query this info
to disable action-safe calcs, DRC and others which
require downscaling.

Change-Id: I1726caa4634f72d781561e797078648524ea2eef

libhwcomposer/hwc_utils.cpp

@@ -569,7 +569,7 @@ void calcExtDisplayPosition(hwc_context_t *ctx,
                                ovutils::eTransform& orient) {
     // Swap width and height when there is a 90deg transform
     int extOrient = getExtOrientation(ctx);
-    if(dpy && !qdutils::MDPVersion::getInstance().is8x26()) {
+    if(dpy && ctx->mOverlay->isUIScalingOnExternalSupported()) {
         if(!isYuvBuffer(hnd)) {
             if(extOrient & HWC_TRANSFORM_ROT_90) {
                 int dstWidth = ctx->dpyAttr[dpy].xres;
@@ -1943,10 +1943,10 @@ int configureSourceSplit(hwc_context_t *ctx, hwc_layer_1_t *layer,
 }
 
 bool canUseRotator(hwc_context_t *ctx, int dpy) {
-    if(qdutils::MDPVersion::getInstance().is8x26() &&
+    if(ctx->mOverlay->isDMAMultiplexingSupported() &&
             isSecondaryConnected(ctx) &&
             !ctx->dpyAttr[HWC_DISPLAY_VIRTUAL].isPause) {
-        /* 8x26 mdss driver supports multiplexing of DMA pipe
+        /* mdss driver on certain targets support multiplexing of DMA pipe
          * in LINE and BLOCK modes for writeback panels.
          */
         if(dpy == HWC_DISPLAY_PRIMARY)