gma broxton: Start off with power domains and CDClk

It's close to the respective code for Skylake but still different
enough for a separate implementation. We start with a default CDClk
of 288MHz which is enough for resolutions up to 2560x1600.

Change-Id: I44364191236f421b2b89c9a019a50713f7c20525
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/18243
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/common/broxton/hw-gfx-gma-power_and_clocks.ads b/common/broxton/hw-gfx-gma-power_and_clocks.ads
index 253d537..86961f6 100644
--- a/common/broxton/hw-gfx-gma-power_and_clocks.ads
+++ b/common/broxton/hw-gfx-gma-power_and_clocks.ads
@@ -14,13 +14,13 @@
 
 private package HW.GFX.GMA.Power_And_Clocks is
 
-   procedure Pre_All_Off is null;
-   procedure Post_All_Off is null;
+   procedure Pre_All_Off;
+   procedure Post_All_Off;
 
-   procedure Initialize is null;
+   procedure Initialize;
 
-   procedure Power_Set_To (Configs : Pipe_Configs) is null;
-   procedure Power_Up (Old_Configs, New_Configs : Pipe_Configs) is null;
-   procedure Power_Down (Old_Configs, Tmp_Configs, New_Configs : Pipe_Configs) is null;
+   procedure Power_Set_To (Configs : Pipe_Configs);
+   procedure Power_Up (Old_Configs, New_Configs : Pipe_Configs);
+   procedure Power_Down (Old_Configs, Tmp_Configs, New_Configs : Pipe_Configs);
 
 end HW.GFX.GMA.Power_And_Clocks;