Added first half of ROI support (#41)

* Finished first half of adding ROI functionality to rocJPEG

* took out unnecessary .h file

* addressed review comments from Aryan

* fixed typo

* fixed documentation in code for decode_params

* fixed the spaces

[ROCm/rocjpeg commit: 6ce373b2a1]

projects/rocjpeg/samples/jpegDecodeBatched/jpegdecodebatched.cpp

@@ -113,7 +113,7 @@ int main(int argc, char **argv) {
                     return EXIT_FAILURE;
             }
 
-            if (rocjpeg_utils.GetChannelPitchAndSizes(decode_params.output_format, subsamplings[index], widths[index].data(), heights[index].data(), num_channels, output_images[index], channel_sizes)) {
+            if (rocjpeg_utils.GetChannelPitchAndSizes(decode_params, subsamplings[index], widths[index].data(), heights[index].data(), num_channels, output_images[index], channel_sizes)) {
                 std::cerr << "ERROR: Failed to get the channel pitch and sizes" << std::endl;
                 return EXIT_FAILURE;
             }