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/drmconnector.cpp b/drmconnector.cpp
index 10b96b5..83d4161 100644
--- a/drmconnector.cpp
+++ b/drmconnector.cpp
@@ -17,7 +17,7 @@
 #define LOG_TAG "hwc-drm-connector"
 
 #include "drmconnector.h"
-#include "drmresources.h"
+#include "drmdevice.h"
 
 #include <errno.h>
 #include <stdint.h>
@@ -27,7 +27,7 @@
 
 namespace android {
 
-DrmConnector::DrmConnector(DrmResources *drm, drmModeConnectorPtr c,
+DrmConnector::DrmConnector(DrmDevice *drm, drmModeConnectorPtr c,
                            DrmEncoder *current_encoder,
                            std::vector<DrmEncoder *> &possible_encoders)
     : drm_(drm),