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/drm/DrmFbImporter.cpp b/drm/DrmFbImporter.cpp
index f82d674..585b789 100644
--- a/drm/DrmFbImporter.cpp
+++ b/drm/DrmFbImporter.cpp
@@ -34,7 +34,7 @@
 
 namespace android {
 
-auto DrmFbIdHandle::CreateInstance(hwc_drm_bo_t *bo, GemHandle first_gem_handle,
+auto DrmFbIdHandle::CreateInstance(BufferInfo *bo, GemHandle first_gem_handle,
                                    DrmDevice &drm)
     -> std::shared_ptr<DrmFbIdHandle> {
   ATRACE_NAME("Import dmabufs and register FB");
@@ -123,7 +123,7 @@
   }
 }
 
-auto DrmFbImporter::GetOrCreateFbId(hwc_drm_bo_t *bo)
+auto DrmFbImporter::GetOrCreateFbId(BufferInfo *bo)
     -> std::shared_ptr<DrmFbIdHandle> {
   /* Lookup DrmFbIdHandle in cache first. First handle serves as a cache key. */
   GemHandle first_handle = 0;