Add api's to dvr_pose to retrieve data from sensord

Bug: 63683612
Test: Manually tested through VrCore cl/164799996.

To retrieve raw data from Tango, added below api's to dvr_api:
- dvrPoseClientGetDataReader
- dvrPoseClientDataCapture
- dvrPoseClientDataReaderDestroy

Note: These changes have already been reviewed in branch
oc-dr1-daydream-dev branch. See change 2729572.

Changes tested on Pixel XL with and without 02 rendering path. Daydream
Home rendering in VR Mode correctly. Pixel functioning as normal.

Change-Id: Ia934d6a1a0b89edfd4408dde19d38e757d44f785
diff --git a/libs/vr/libdvr/Android.bp b/libs/vr/libdvr/Android.bp
index 7fe9825..9fe161d 100644
--- a/libs/vr/libdvr/Android.bp
+++ b/libs/vr/libdvr/Android.bp
@@ -32,6 +32,7 @@
     "dvr_display_manager.cpp",
     "dvr_hardware_composer_client.cpp",
     "dvr_performance.cpp",
+    "dvr_pose.cpp",
     "dvr_surface.cpp",
     "dvr_vsync.cpp",
 ]