[netdevice] Remove const from MockNetworkDeviceIfc

llvm/llvm-project#121419 added
-Wignored-qualifiers diagnostic for cv-qualified base
classes. This patch removes const from MockNetworkDeviceIfc
to fix the -Wignored-qualifiers error similar to
https://fxrev.dev/1192542.

Bug: 391704289
Change-Id: I01fe73aa25850fa21d3ac10a14e894aed51e5419
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1194243
Fuchsia-Auto-Submit: Gulfem Savrun Yeniceri <[email protected]>
Reviewed-by: Bruno Dal Bo <[email protected]>
Commit-Queue: Auto-Submit <[email protected]>

Author: gulfemsavrun

src/connectivity/ethernet/drivers/ethernet/netdevice-migration/unit-tests.cc

@@ -248,7 +248,7 @@ class NetdeviceMigrationTest : public ::testing::Test {
   }
 
   MockDevice& Parent() { return *parent_; }
-  testing::StrictMock<const MockNetworkDeviceIfc>& MockNetworkDevice() {
+  testing::StrictMock<MockNetworkDeviceIfc>& MockNetworkDevice() {
     return mock_network_device_ifc_;
   }
   testing::StrictMock<MockEthernetImpl>& MockEthernet() { return mock_ethernet_impl_; }
@@ -257,7 +257,7 @@ class NetdeviceMigrationTest : public ::testing::Test {
 
  private:
   const std::shared_ptr<MockDevice> parent_;
-  testing::StrictMock<const MockNetworkDeviceIfc> mock_network_device_ifc_;
+  testing::StrictMock<MockNetworkDeviceIfc> mock_network_device_ifc_;
   testing::StrictMock<MockEthernetImpl> mock_ethernet_impl_;
   std::unique_ptr<netdevice_migration::NetdeviceMigration> device_;
   bool queued_rx_space_ = false;