message: core(intrin): avoid symbols duplication from SIMD128/256 cases
  All vx_call() must be wrapped into own simd128/simd256/simd512 namespace
  ```
  namespace CV__SIMD_NAMESPACE {
  ... vx_call declaration is here ...
  }
  ```
diff: @@ -296,11 +296,17 @@ template<typename _Tp> struct V_RegTraits
  #endif
  #if CV_SIMD512 && (!defined(CV__SIMD_FORCE_WIDTH) || CV__SIMD_FORCE_WIDTH == 512)
  +#define CV__SIMD_NAMESPACE simd512
  +namespace CV__SIMD_NAMESPACE {
  #define CV_SIMD 1
  #define CV_SIMD_64F CV_SIMD512_64F
  #define CV_SIMD_WIDTH 64
  // TODO typedef v_uint8 / v_int32 / etc types here
  +} // namespace
  +using namespace CV__SIMD_NAMESPACE;
  #elif CV_SIMD256 && (!defined(CV__SIMD_FORCE_WIDTH) || CV__SIMD_FORCE_WIDTH == 256)
  +#define CV__SIMD_NAMESPACE simd256
  +namespace CV__SIMD_NAMESPACE {
  #define CV_SIMD 1
  #define CV_SIMD_64F CV_SIMD256_64F
  #define CV_SIMD_WIDTH 32
  @@ -323,7 +329,11 @@ template<typename _Tp> struct V_RegTraits
  CV_INTRIN_DEFINE_WIDE_INTRIN_ALL_TYPES(v256)
  CV_INTRIN_DEFINE_WIDE_INTRIN(double, v_float64, f64, v256, load)
  inline void vx_cleanup() { v256_cleanup(); }
  +} // namespace
  +using namespace CV__SIMD_NAMESPACE;
  #elif (CV_SIMD128 || CV_SIMD128_CPP) && (!defined(CV__SIMD_FORCE_WIDTH) || CV__SIMD_FORCE_WIDTH == 128)
  +#define CV__SIMD_NAMESPACE simd128
  +namespace CV__SIMD_NAMESPACE {
  #define CV_SIMD CV_SIMD128
  #define CV_SIMD_64F CV_SIMD128_64F
  #define CV_SIMD_WIDTH 16
  @@ -348,6 +358,8 @@ template<typename _Tp> struct V_RegTraits
  CV_INTRIN_DEFINE_WIDE_INTRIN(double, v_float64, f64, v, load)
  #endif
  inline void vx_cleanup() { v_cleanup(); }
  +} // namespace
  +using namespace CV__SIMD_NAMESPACE;
  #endif
  inline unsigned int trailingZeros32(unsigned int value) {
  