gma config, port detection: Scatter Valid_Port initialization

We did overwrite most the default values for `Config.Valid_Port` anyway.
So move the few remaining defaults where they are visible together with
the other runtime settings.

Change-Id: I17df08de0aa1ffb303646ea564c100bb702407f5
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/27047
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/common/ironlake/hw-gfx-gma-port_detect.adb b/common/ironlake/hw-gfx-gma-port_detect.adb
index 900c505..5af2e84 100644
--- a/common/ironlake/hw-gfx-gma-port_detect.adb
+++ b/common/ironlake/hw-gfx-gma-port_detect.adb
@@ -69,6 +69,8 @@
          PCH_HDMI_C => DP2,
          PCH_HDMI_D => DP3);
    begin
+      Config.Valid_Port (Analog) := True;
+
       case Config.Internal_Display is
          when LVDS =>
             -- PCH_LVDS