gma: Add a flag to use GMCH transcoder registers

Change-Id: Ic9bff918bdcab3c5c55316cb6de1a8a8bf1c6430
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/25406
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/common/hw-gfx-gma-registers.ads b/common/hw-gfx-gma-registers.ads
index 37e62e8..40d3437 100644
--- a/common/hw-gfx-gma-registers.ads
+++ b/common/hw-gfx-gma-registers.ads
@@ -436,6 +436,10 @@
       PIPEACONF,
       PIPEAMISC,
       PIPE_FRMCNT_A,
+      PIPEA_GMCH_DATA_M,
+      PIPEA_GMCH_DATA_N,
+      PIPEA_GMCH_LINK_M,
+      PIPEA_GMCH_LINK_N,
       DSPACNTR,
       DSPALINOFF,
       DSPASTRIDE,
@@ -457,6 +461,10 @@
       PIPEBCONF,
       PIPEBMISC,
       PIPE_FRMCNT_B,
+      PIPEB_GMCH_DATA_M,
+      PIPEB_GMCH_DATA_N,
+      PIPEB_GMCH_LINK_M,
+      PIPEB_GMCH_LINK_N,
       DSPBCNTR,
       DSPBLINOFF,
       DSPBSTRIDE,
@@ -707,6 +715,10 @@
       PIPEA_DATA_N1         => 16#06_0034# / Register_Width,
       PIPEA_LINK_M1         => 16#06_0040# / Register_Width,
       PIPEA_LINK_N1         => 16#06_0044# / Register_Width,
+      PIPEA_GMCH_DATA_M     => 16#07_0050# / Register_Width,
+      PIPEA_GMCH_DATA_N     => 16#07_0054# / Register_Width,
+      PIPEA_GMCH_LINK_M     => 16#07_0060# / Register_Width,
+      PIPEA_GMCH_LINK_N     => 16#07_0064# / Register_Width,
       PIPEA_DDI_FUNC_CTL    => 16#06_0400# / Register_Width,
       PIPEA_MSA_MISC        => 16#06_0410# / Register_Width,
 
@@ -798,6 +810,10 @@
       PIPEB_DATA_N1         => 16#06_1034# / Register_Width,
       PIPEB_LINK_M1         => 16#06_1040# / Register_Width,
       PIPEB_LINK_N1         => 16#06_1044# / Register_Width,
+      PIPEB_GMCH_DATA_M     => 16#07_1050# / Register_Width,
+      PIPEB_GMCH_DATA_N     => 16#07_1054# / Register_Width,
+      PIPEB_GMCH_LINK_M     => 16#07_1060# / Register_Width,
+      PIPEB_GMCH_LINK_N     => 16#07_1064# / Register_Width,
       PIPEB_DDI_FUNC_CTL    => 16#06_1400# / Register_Width,
       PIPEB_MSA_MISC        => 16#06_1410# / Register_Width,