T-API: changed base types for cv::memopTypeToStr

**merge after https://github.com/Itseez/opencv/pull/2893**

**Description:**
* changes base types for `cv::memopTypeToStr` (e.g. `int` is better than `uchar4`)

**Performance report:**
TBD

check_regression=*OCL*Bitwise*:*OCL*Repeat*
test_modules=core
test_filter=*OCL*Bitwise*:*OCL*Repeat*
build_examples=OFF