Only x550em_x V1 was supported before. Now V2 is supported.
A mask for V1 and V2 is defined and used to support both.
+* **Added sw-firmware sync on X550EM_a.**
+
+ Added support for sw-firmware sync for resource sharing.
+ Use the PHY token, shared between sw-fw for PHY access on X550EM_a.
+
* **Enabled PCI extended tag for i40e.**
It enabled extended tag by checking and writing corresponding PCI config