hwc: 8x26: Composition policy when WFD connected

When WFD is connected to 8x26
1) On Video transition, have 1 padding round if external connected.
Required to shift pipes across mixers.
2) Request DMA pipe always for FB on WFD.
Necessary for rotation + writeback
3) Disable non-worm-hole calcs on external (because of 2)
4) Disable action-safe calcs on external (because of 2)

Change-Id: I63b50b2477db443f9ea1d3fa610b59295c9359b7

libhwcomposer/hwc.cpp

@@ -88,7 +88,6 @@ static void hwc_registerProcs(struct hwc_composer_device_1* dev,
 //Helper
 static void reset(hwc_context_t *ctx, int numDisplays,
                   hwc_display_contents_1_t** displays) {
-    memset(ctx->listStats, 0, sizeof(ctx->listStats));
     for(int i = 0; i < MAX_DISPLAYS; i++) {
         hwc_display_contents_1_t *list = displays[i];
         // XXX:SurfaceFlinger no longer guarantees that this
@@ -497,6 +496,7 @@ static int hwc_set(hwc_composer_device_1 *dev,
     // frames to the display.
     CALC_FPS();
     MDPComp::resetIdleFallBack();
+    ctx->mVideoTransFlag = false;
     return ret;
 }