gallium, rusticl, llvmpipe, iris: Implement cl_khr_image2d_from_buffer for llvmpipe and iris in rusticl
- Modified llvmpipe/cs to enable the use of images created from buffers
- Implement spec in rusticl
- Add support for clEnqueueReadImage, clEnqueueWriteImage, clEnqueueFillImage, clEnqueueCopyImage, clEnqueueCopyImageToBuffer, clEnqueueCopyBufferToImage and clEnqueueMapImage functions
Signed-off-by: Antonio Gomes antoniospg100@gmail.com