gma: Make Raw_Clock a variable

On GMCH the Raw_Clock depends on the FSB frequency.

Change-Id: I11af9ecb3504983ba1d3136c1b82bd14363afdba
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/25403
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/common/haswell_shared/hw-gfx-gma-power_and_clocks_haswell.adb b/common/haswell_shared/hw-gfx-gma-power_and_clocks_haswell.adb
index 41d340a..c0d1e78 100644
--- a/common/haswell_shared/hw-gfx-gma-power_and_clocks_haswell.adb
+++ b/common/haswell_shared/hw-gfx-gma-power_and_clocks_haswell.adb
@@ -207,6 +207,7 @@
    begin
       -- HSW: disable power down well
       PDW_Off;
+      Config.Raw_Clock := Config.Default_RawClk_Freq;
    end Initialize;
 
    procedure Power_Set_To (Configs : Pipe_Configs) is