isl/state: Don't force-disable L2 bypass for everything

We already set the bit in the few cases where it's required by the docs so
there's no need to set it all the time.  This has no noticable perf impact
for Dota 2 on Vulkan with the time demo I have.

Reviewed-by: Chad Versace <chad.versace@intel.com>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>

src/intel/isl/isl_surface_state.c

@@ -310,10 +310,6 @@ isl_genX(surf_fill_state_s)(const struct isl_device *dev, void *state,
                                                      TILEWALK_YMAJOR;
 #endif
 
-#if GEN_GEN >= 8
-   s.SamplerL2BypassModeDisable = true;
-#endif
-
 #if GEN_GEN >= 8
    s.RenderCacheReadWriteMode = WriteOnlyCache;
 #else
@@ -431,7 +427,6 @@ isl_genX(buffer_fill_state_s)(void *state,
 #endif
 
 #if (GEN_GEN >= 8)
-      .SamplerL2BypassModeDisable = true,
       .RenderCacheReadWriteMode = WriteOnlyCache,
 #else
       .RenderCacheReadWriteMode = 0,