intel/dev: use GFX_VERx10 to detect genX compilation

Depending on the ordering of includes, GFX_VER may not defined for
intel_device_info.h.  The failure mode of this case is silent:
BITSET_TEST will be called when it could be compiled out.

GFX_VERx10 should be used in place of GFX_VER.  GFX_VERx10 is defined
by a compiler flag, and is always present for genX compilation units.

Fixes: 3c9a8f7a6d2 ("intel/dev: generate helpers to identify platform workarounds")
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21908>
diff --git a/src/intel/dev/intel_device_info.h b/src/intel/dev/intel_device_info.h
index 865416e..bf7be9a 100644
--- a/src/intel/dev/intel_device_info.h
+++ b/src/intel/dev/intel_device_info.h
@@ -575,7 +575,7 @@
 bool intel_device_info_compute_system_memory(struct intel_device_info *devinfo, bool update);
 void intel_device_info_update_after_hwconfig(struct intel_device_info *devinfo);
 
-#ifdef GFX_VER
+#ifdef GFX_VERx10
 #define intel_needs_workaround(devinfo, id)         \
    INTEL_WA_ ## id ## _GFX_VER &&                              \
    BITSET_TEST(devinfo->workarounds, INTEL_WA_##id)