gma config: Enable Restrictions (No_Elaboration_Code)

Forcing compile-time evaluation seems to be the right thing and works
well now. It also helps to compare binaries after refactorizations.

Change-Id: I4eea973836a05eefcc2c98de75e6721ef3cd278b
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/27143
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/common/hw-gfx-gma-config.ads.template b/common/hw-gfx-gma-config.ads.template
index 721252b..bf69dc8 100644
--- a/common/hw-gfx-gma-config.ads.template
+++ b/common/hw-gfx-gma-config.ads.template
@@ -12,6 +12,8 @@
 -- GNU General Public License for more details.
 --
 
+pragma Restrictions (No_Elaboration_Code);
+
 private package HW.GFX.GMA.Config is
 
    Gen : constant Generation := <<GEN>>;