tools/pci: Use pci_device_enable() to enable bridge

Enabling the bridge by writing to the PCI config space does not enable
all the host resources required.
Use pci_device_enable api.

Signed-off-by: Vivekanand Veeracholan <vveerach@google.com>
Change-Id: I159a132b76eadc569efb8fb47488a4abd4c27404
diff --git a/tools/test/tools_pci_unittest.cpp b/tools/test/tools_pci_unittest.cpp
index 7f69db2..6906851 100644
--- a/tools/test/tools_pci_unittest.cpp
+++ b/tools/test/tools_pci_unittest.cpp
@@ -317,6 +317,8 @@
                 pci_device_unmap_range(Eq(&dev), Eq(region), mockRegionSize))
         .WillOnce(Return(0));
 
+    EXPECT_CALL(pciMock, pci_device_enable(Eq(&dev))).Times(1);
+
     if (deviceExpectations)
         param->expectSetup(pciMock, dev);
 }