drm_hwcomposer: Move include/drmhwcgralloc.h to bufferinfo/BufferInfo.h

... to emphasize its purpose.

- Rename struct HwcDrmBo -> struct BufferInfo
- Remove unused BufferInfo::acquire_fence, BufferInfo::hal_format and
  BufferInfo::usage fields

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
diff --git a/bufferinfo/legacy/BufferInfoMaliHisi.h b/bufferinfo/legacy/BufferInfoMaliHisi.h
index 698a0d3..e809d06 100644
--- a/bufferinfo/legacy/BufferInfoMaliHisi.h
+++ b/bufferinfo/legacy/BufferInfoMaliHisi.h
@@ -27,7 +27,7 @@
  public:
   using LegacyBufferInfoGetter::LegacyBufferInfoGetter;
 
-  int ConvertBoInfo(buffer_handle_t handle, hwc_drm_bo_t *bo) override;
+  int ConvertBoInfo(buffer_handle_t handle, BufferInfo *bo) override;
 
  private:
   uint64_t ConvertGrallocFormatToDrmModifiers(uint64_t flags, bool is_rgb);