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/DrmCrtc.cpp b/drm/DrmCrtc.cpp
index bc19141..b54f14b 100644
--- a/drm/DrmCrtc.cpp
+++ b/drm/DrmCrtc.cpp
@@ -35,7 +35,7 @@
 
 auto DrmCrtc::CreateInstance(DrmDevice &dev, uint32_t crtc_id, uint32_t index)
     -> std::unique_ptr<DrmCrtc> {
-  auto crtc = MakeDrmModeCrtcUnique(dev.fd(), crtc_id);
+  auto crtc = MakeDrmModeCrtcUnique(dev.GetFd(), crtc_id);
   if (!crtc) {
     ALOGE("Failed to get CRTC %d", crtc_id);
     return {};