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/DrmPlane.cpp b/drm/DrmPlane.cpp
index 6b5cec1..28f48f3 100644
--- a/drm/DrmPlane.cpp
+++ b/drm/DrmPlane.cpp
@@ -31,7 +31,7 @@
 
 auto DrmPlane::CreateInstance(DrmDevice &dev, uint32_t plane_id)
     -> std::unique_ptr<DrmPlane> {
-  auto p = MakeDrmModePlaneUnique(dev.fd(), plane_id);
+  auto p = MakeDrmModePlaneUnique(dev.GetFd(), plane_id);
   if (!p) {
     ALOGE("Failed to get plane %d", plane_id);
     return {};