drm_hwcomposer: Tidy-up DrmDevice class

1. Move drm/DrmConnector.h to Normal clang-tidy checks list by fixing
   clang-tidy findings.

2. Remove DrmDevice self-reference.

3. Replace shared_ptr reference to DrmDevice in DrmFbImporter with a
   pointer, making ResourceManager only owner of DrmDevice and its
   chilren.

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
diff --git a/drm/VSyncWorker.cpp b/drm/VSyncWorker.cpp
index 3bcb4d0..64af85b 100644
--- a/drm/VSyncWorker.cpp
+++ b/drm/VSyncWorker.cpp
@@ -140,7 +140,7 @@
   vblank.request.sequence = 1;
 
   int64_t timestamp = 0;
-  ret = drmWaitVBlank(drm_->fd(), &vblank);
+  ret = drmWaitVBlank(drm_->GetFd(), &vblank);
   if (ret == -EINTR)
     return;