liboverlay: Add support for MDSS Bandwidth Compression

- This adds support for Bandwidth Compression.
- If MDSS supports BWC, then we set BWC flags
  to both Rotator(encode) and overlay(decode)

Change-Id: I6f7800716a2ce2ab855f4c0b1a53cd96f7d06d74
diff --git a/libqdutils/mdp_version.h b/libqdutils/mdp_version.h
index 2fca640..0586001 100644
--- a/libqdutils/mdp_version.h
+++ b/libqdutils/mdp_version.h
@@ -82,6 +82,7 @@
     uint8_t getDMAPipes() { return mDMAPipes; }
     bool supportsDecimation();
     uint32_t getMaxMDPDownscale();
+    bool supportsBWC();
 private:
     int mMDPVersion;
     char mPanelType;