quick fix in tests (#11812)

src/plugins/intel_gpu/tests/test_cases/border_gpu_test.cpp

@@ -38,10 +38,6 @@ static int mult(T arr) {
     });
 }
 
-std::ostream& operator<<(std::ostream& os, FLOAT16 x) {
-    return os << float(x);
-}
-
 #define PAD_MODES \
     border_type::constant, border_type::edge, border_type::mirror, border_type::mirror_101  //,border_type::zero
 #define FORMATS                                                                                                   \

src/plugins/intel_gpu/tests/test_cases/gather_gpu_test.cpp

@@ -13,10 +13,6 @@
 using namespace cldnn;
 using namespace ::tests;
 
-std::ostream& operator<<(std::ostream& os, FLOAT16 x) {
-    return os << float(x);
-}
-
 template <class T>
 int get_not_one_dim(const T& a) {
     int ret = a.size();