hwc: Populate frame rate in rotator set

- Populate frame_rate in rotator set, so that driver
  can vote for honest BW for rotator based on frame rate.
- If metadata contains source fps, frame_rate will be set
  to source fps, else it will be set to primary refresh rate.
- frame_rate will be populated for primary with
  source fps from metada, only when secondary is not active.

Change-Id: Icaacd0ed67ec09591d31868591680d2e86fe54a2
diff --git a/liboverlay/overlayRotator.h b/liboverlay/overlayRotator.h
index e045b44..0766c86 100644
--- a/liboverlay/overlayRotator.h
+++ b/liboverlay/overlayRotator.h
@@ -97,6 +97,7 @@
     virtual bool queueBuffer(int fd, uint32_t offset) = 0;
     virtual void dump() const = 0;
     virtual void getDump(char *buf, size_t len) const = 0;
+    virtual void setFrameRate(uint32_t frame_rate) = 0;
     inline void setCurrBufReleaseFd(const int& fence) {
         mMem.setCurrBufReleaseFd(fence);
     }
@@ -150,6 +151,7 @@
     virtual bool queueBuffer(int fd, uint32_t offset);
     virtual void dump() const;
     virtual void getDump(char *buf, size_t len) const;
+    virtual void setFrameRate(uint32_t frame_rate);
 
 private:
     explicit MdpRot();
@@ -222,6 +224,7 @@
     virtual bool queueBuffer(int fd, uint32_t offset);
     virtual void dump() const;
     virtual void getDump(char *buf, size_t len) const;
+    virtual void setFrameRate(uint32_t frame_rate);
 
 private:
     explicit MdssRot();