T-API: cv::norm with 2 args

**Changes from https://github.com/Itseez/opencv/pull/2833:**
* optimized min/max calculation
* previously, `minMaxLoc` always found all min/max/minloc/maxloc, but now only if appropriate parameter isn't set to `NULL`
* used vector data types
* merged `abs`+`minMax` into `minMax` in norm with `NORM_INF`

**New changes**:
* merged multiple kernels into one

**Performance report:**
http://ocl.itseez.com/intel/export/perf/pr/2837/report/

check_regression=*OCL*Norm*:*OCL*MinMaxLoc*
test_filter=*OCL*Norm*:*OCL*MinMax*:*OCL*Count*:*OCL*Dot*:*OCL*Sum*
test_modules=core
build_examples=OFF