android-nn-driver getType returns the right device

* ArmnnDriver queries the options and returns CPU or GPU
  depending on which is the first backend listed in the options

* Resolves MLCE-401

Change-Id: If4e63e144507e817449f37926711fa325861b57d
Signed-off-by: Pablo Tello <pablo.tello@arm.com>
diff --git a/1.3/ArmnnDriver.hpp b/1.3/ArmnnDriver.hpp
index 451b5ab..fd4aa74 100644
--- a/1.3/ArmnnDriver.hpp
+++ b/1.3/ArmnnDriver.hpp
@@ -244,8 +244,8 @@
     Return<void> getType(getType_cb cb)
     {
         ALOGV("hal_1_3::ArmnnDriver::getType()");
-
-        cb(V1_0::ErrorStatus::NONE, V1_2::DeviceType::CPU);
+        const auto device_type = hal_1_2::HalPolicy::GetDeviceTypeFromOptions(this->m_Options);
+        cb(V1_0::ErrorStatus::NONE, device_type);
         return Void();
     }