bruteforce: Update ULP for half-precision divide to 1.0f (#2214)

CTS test update to match proposed spec update
KhronosGroup/OpenCL-Docs#1278

Author: Sreelakshmi Haridas Maruthur

test_conformance/math_brute_force/function_list.cpp

@@ -425,7 +425,7 @@ const Func functionList[] = {
       { (void*)reference_relaxed_divide },
       2.5f,
       0.0f,
-      0.0f,
+      1.0f,
       3.0f,
       2.5f,
       INFINITY,