drm/i915/gt: drop dependency on VLV_DISPLAY_BASE

CHV_FUSE_GT (0x182168) is purely about GT fuses, therefore belongs in
intel_gt_regs.h, is in the gcfgmmio unit, but is technically in the VLV
display base area.

Add VLV_GUNIT_BASE to drop dependency on VLV_DISPLAY_BASE and thus
display/intel_display_reg_defs.h in intel_gt_regs.h.

v2: Add VLV_GUNIT_BASE (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230511152153.986676-1-jani.nikula@intel.com

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -7,7 +7,8 @@
 #define __INTEL_GT_REGS__
 
 #include "i915_reg_defs.h"
-#include "display/intel_display_reg_defs.h"	/* VLV_DISPLAY_BASE */
+
+#define VLV_GUNIT_BASE			0x180000
 
 /*
  * The perf control registers are technically multicast registers, but the
@@ -1450,7 +1451,7 @@
 #define GEN12_RCU_MODE				_MMIO(0x14800)
 #define   GEN12_RCU_MODE_CCS_ENABLE		REG_BIT(0)
 
-#define CHV_FUSE_GT				_MMIO(VLV_DISPLAY_BASE + 0x2168)
+#define CHV_FUSE_GT				_MMIO(VLV_GUNIT_BASE + 0x2168)
 #define   CHV_FGT_DISABLE_SS0			(1 << 10)
 #define   CHV_FGT_DISABLE_SS1			(1 << 11)
 #define   CHV_FGT_EU_DIS_SS0_R0_SHIFT		16