drm/i915: remove intel_vgpu_fence::base

intel_vgpu_fence::base was never used since its addition in commit
28a60dee (drm/i915/gvt: vGPU HW resource management). Drop it.

Found by https://github.com/jirislaby/clang-struct.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240216065326.6910-13-jirislaby@kernel.org

drivers/gpu/drm/i915/gvt/gvt.h

@@ -89,7 +89,6 @@ struct intel_vgpu_gm {
 /* Fences owned by a vGPU */
 struct intel_vgpu_fence {
 	struct i915_fence_reg *regs[INTEL_GVT_MAX_NUM_FENCES];
-	u32 base;
 	u32 size;
 };
 
@@ -444,7 +443,6 @@ int intel_gvt_load_firmware(struct intel_gvt *gvt);
 #define vgpu_hidden_gmadr_end(vgpu) \
 	(vgpu_hidden_gmadr_base(vgpu) + vgpu_hidden_sz(vgpu) - 1)
 
-#define vgpu_fence_base(vgpu) (vgpu->fence.base)
 #define vgpu_fence_sz(vgpu) (vgpu->fence.size)
 
 /* ring context size i.e. the first 0x50 dwords*/