drm/i915/ats-m: add ATS-M platform info

ATS-M is a server platform based on Xe_HPG and Xe_HPM, but without
display support.  From a driver point of view, it's easiest to just
handle it as DG2 (including identifying as PLATFORM_DG2), but with the
display disabled in the device info.
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220329000822.1323195-1-matthew.d.roper@intel.com

drivers/gpu/drm/i915/i915_pci.c

@@ -1038,25 +1038,35 @@ static const struct intel_device_info xehpsdv_info = {
 	.require_force_probe = 1,
 };
 
+#define DG2_FEATURES \
+	XE_HP_FEATURES, \
+	XE_HPM_FEATURES, \
+	DGFX_FEATURES, \
+	.graphics.rel = 55, \
+	.media.rel = 55, \
+	PLATFORM(INTEL_DG2), \
+	.has_4tile = 1, \
+	.has_64k_pages = 1, \
+	.has_guc_deprivilege = 1, \
+	.platform_engine_mask = \
+		BIT(RCS0) | BIT(BCS0) | \
+		BIT(VECS0) | BIT(VECS1) | \
+		BIT(VCS0) | BIT(VCS2)
+
 __maybe_unused
 static const struct intel_device_info dg2_info = {
-	XE_HP_FEATURES,
-	XE_HPM_FEATURES,
+	DG2_FEATURES,
 	XE_LPD_FEATURES,
-	DGFX_FEATURES,
-	.graphics.rel = 55,
-	.media.rel = 55,
-	.has_4tile = 1,
-	PLATFORM(INTEL_DG2),
-	.has_guc_deprivilege = 1,
-	.has_64k_pages = 1,
-	.platform_engine_mask =
-		BIT(RCS0) | BIT(BCS0) |
-		BIT(VECS0) | BIT(VECS1) |
-		BIT(VCS0) | BIT(VCS2),
-	.require_force_probe = 1,
 	.display.cpu_transcoder_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) |
 			       BIT(TRANSCODER_C) | BIT(TRANSCODER_D),
+	.require_force_probe = 1,
+};
+
+__maybe_unused
+static const struct intel_device_info ats_m_info = {
+	DG2_FEATURES,
+	.display = { 0 },
+	.require_force_probe = 1,
 };
 
 #undef PLATFORM