OvmfPkg/VirtCommunicationDxe: add IoLib to VirtMmCommunication.inf

fix for RELEASE build error with QEMU_PV_VARS

Signed-off-by: Limin Wang <wanglmb@163.com>
diff --git a/OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.inf b/OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.inf
index 6a72da7..29485b5 100644
--- a/OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.inf
+++ b/OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.inf
@@ -39,6 +39,7 @@
   DebugLib

   DxeServicesTableLib

   HobLib

+  IoLib

   MemoryAllocationLib

   UefiDriverEntryPoint