direct pci: Always initialize Address_State

Let Initialize() always initialize the Address_State. This is not only
the expected behaviour but also necessary to share the contract with
other implementations.

Change-Id: I0454dfd6c36f7d4298edeec5b84d929e3160eb7b
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/21205
Reviewed-by: Adrian-Ken Rueegsegger <ken@codelabs.ch>

common/direct/hw-pci-dev.adb

@@ -108,6 +108,8 @@ is
    begin
       if MMConf_Base /= 0 then
          MM.Set_Base_Address (MMConf_Base);
+      else
+         MM.Set_Base_Address (Config.Default_MMConf_Base);
       end if;
       Success := MMConf_Base /= 0 or Config.Default_MMConf_Base_Set;
    end Initialize;