drm_hwcomposer: Rename DrmResources to DrmDevice

DrmDevice is a better name to reflect the fact that DrmResources/
DrmDevice can handle just one dri node.

Suggested here [1] by Sean Paul.
[1] https://lists.freedesktop.org/archives/dri-devel/2018-April/173290.html

Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
diff --git a/drmcrtc.h b/drmcrtc.h
index c5a5599..3e17abd 100644
--- a/drmcrtc.h
+++ b/drmcrtc.h
@@ -25,11 +25,11 @@
 
 namespace android {
 
-class DrmResources;
+class DrmDevice;
 
 class DrmCrtc {
  public:
-  DrmCrtc(DrmResources *drm, drmModeCrtcPtr c, unsigned pipe);
+  DrmCrtc(DrmDevice *drm, drmModeCrtcPtr c, unsigned pipe);
   DrmCrtc(const DrmCrtc &) = delete;
   DrmCrtc &operator=(const DrmCrtc &) = delete;
 
@@ -48,7 +48,7 @@
   const DrmProperty &out_fence_ptr_property() const;
 
  private:
-  DrmResources *drm_;
+  DrmDevice *drm_;
 
   uint32_t id_;
   unsigned pipe_;