teflon/tests: Increase tolerance

On Rockchip, we need a tolerance of 8 to pass all tests (especifically
the whole MobileNetV1 model).

Though all other tests pass with a tolerance of just 2, 8 is still not
that high that we would risk letting bugs slip in.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29698>

src/gallium/targets/teflon/test_teflon.cpp

@@ -24,7 +24,7 @@
 #define TEST_FULLY_CONNECTED 1
 #define TEST_MODELS          1
 
-#define TOLERANCE 2
+#define TOLERANCE 8
 
 std::vector<bool> is_signed{false}; /* TODO: Support INT8? */
 std::vector<bool> padding_same{false, true};