OpenCL on ARM RPI 4 - OpenCL initialised successfully.
I've recently built [clvk](https://github.com/kpet/clvk) which is an OpenCL wrapper around Vulkan, which seems to work successfully  (at least their simple tests pass), on the RPI 4 8GB  (Raspberry PI OS 64bit), for its Broadcom Videocore 6 SoC GPU.
I'd like to mine Monero (rx/0) using the GPU, this is more or less an academic exercise to see if it can be achieved due to obvious performance issues.

I have modified a couple of xmrig files to allow this non valid OpenCL platform to start ([changes.txt attached here](https://github.com/xmrig/xmrig/files/7953561/changes.txt) as per GPL 3 license).

Aside from some missing/incorrect summary data (see output below) it seems like it may work, however as you can see the pool's response stated that no algorithms are supported which I believe means that the GPU is not registered as supporting rx/0. On other platforms a GPU can be used to mine using rx/0.

Is it possible to enable rx/0 on this ARM/OpenCL implementation and if so how?

Here's my last run

```
WARNING: v3dv is neither a complete nor a conformant Vulkan implementation. Testing use only.
WARNING: lavapipe is not a conformant vulkan implementation, testing use only.
 * ABOUT        XMRig/6.16.2 gcc/10.2.1
 * LIBS         libuv/1.40.0 OpenSSL/1.1.1k hwloc/2.4.1
 * HUGE PAGES   supported
 * 1GB PAGES    unavailable
 * CPU          ARM Cortex-A72 (1) 64-bit -AES
                L2:0.0 MB L3:0.0 MB 4C/4T NUMA:1
 * MEMORY       3.3/7.5 GB (44%)
 * DONATE       0%
 * POOL #1      gulf.moneroocean.stream:10002 algo auto
 * COMMANDS     hashrate, pause, resume, results, connection
 * ADL          disabled (failed to load ADL)
 * OPENCL       #0 (null)/(null)
 * OPENCL GPU   #0 n/a V3D 4.2 0 MHz cu:1 mem:128/512 MB
 * CUDA         disabled
[2022-01-27 20:07:39.443]  net      gulf.moneroocean.stream:10002 error: "algo array must include at least one supported pool algo: []", code: -1
```