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

**merge after https://github.com/Itseez/opencv/pull/2893**

**Description:**
* changed base types for `cv::memopTypeToStr` (e.g. `int` is better than `uchar4`)

**Performance report:**
http://ocl.itseez.com/intel/export/perf/pr/2921/report/

check_regression=*OCL*Bitwise*:*OCL*Repeat*:*OCL*SetIden*:*OCL*Flip*:*OCL*CopyTo*:*OCL*Resize*
test_modules=core,imgproc
test_filter=*OCL*Bitwise*:*OCL*Repeat*:*OCL*SetIden*:*OCL*Flip*:*OCL*CopyTo*:*OCL*Resize*
build_examples=OFF