Update GNSS/EVS HALs to use elided interface return values.

Test: mma
Bug: 31830743
Change-Id: Id57944c69de37b20409215ef600b553ce5e2526e
diff --git a/evs/1.0/default/EvsEnumerator.h b/evs/1.0/default/EvsEnumerator.h
index 69caa17..90df837 100644
--- a/evs/1.0/default/EvsEnumerator.h
+++ b/evs/1.0/default/EvsEnumerator.h
@@ -34,9 +34,9 @@
 public:
     // Methods from ::android::hardware::evs::V1_0::IEvsEnumerator follow.
     Return<void> getCameraList(getCameraList_cb _hidl_cb)  override;
-    Return<void> openCamera(const hidl_string& cameraId, openCamera_cb callback)  override;
+    Return<sp<IEvsCamera>> openCamera(const hidl_string& cameraId) override;
     Return<void> closeCamera(const ::android::sp<IEvsCamera>& carCamera)  override;
-    Return<void> openDisplay(openDisplay_cb callback)  override;
+    Return<sp<IEvsDisplay>> openDisplay()  override;
     Return<void> closeDisplay(const ::android::sp<IEvsDisplay>& display)  override;
 
     // Implementation details