gma: Fix setting of `Raw Clock` scratchpad

On some platforms, we determine the `Raw Clock` frequency at runtime.
Make sure that we write the up-to-date value in PCH_RAWCLK_FREQ.

Change-Id: I50c299f6861ef313f2f11d146c4efa7204d53296
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/48761
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/common/hw-gfx-gma.adb b/common/hw-gfx-gma.adb
index 9157bbe..3305aeb 100644
--- a/common/hw-gfx-gma.adb
+++ b/common/hw-gfx-gma.adb
@@ -538,7 +538,7 @@
          Registers.Unset_And_Set_Mask
            (Register    => Registers.PCH_RAWCLK_FREQ,
             Mask_Unset  => PCH_RAWCLK_FREQ_MASK,
-            Mask_Set    => PCH_RAWCLK_FREQ (Config.Default_RawClk_Freq));
+            Mask_Set    => PCH_RAWCLK_FREQ (Config.Raw_Clock));
       end if;
 
       Initialized := True;