drm_hwcomposer: Move DrmHwcTwo.{cpp|h} to hwc2_device/ directory

To keep all frontend-related files in a single directory.

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
diff --git a/Android.bp b/Android.bp
index d72e13a..59aa05f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -81,8 +81,6 @@
 filegroup {
     name: "drm_hwcomposer_common",
     srcs: [
-        "DrmHwcTwo.cpp",
-
         "bufferinfo/BufferInfoGetter.cpp",
         "bufferinfo/BufferInfoMapperMetadata.cpp",
 
@@ -110,6 +108,7 @@
         "backend/BackendManager.cpp",
         "backend/BackendRCarDu.cpp",
 
+        "hwc2_device/DrmHwcTwo.cpp",
         "hwc2_device/HwcDisplay.cpp",
         "hwc2_device/HwcLayer.cpp",
         "hwc2_device/hwc2_device.cpp",