Support hot-plugging exernal GPU(s)

### What is the issue? My setup: - Notebook: (Framework 13") with an AMD Ryzen 7840U / Radeon 780M GPU - eGPU (connected via USB3/4 encolosure "Razer Core X Chroma"): AMD Radeon RX 7600 XT - OS: Windows 11 / Fedora 41 I started Ollama when the eGPU was still attached and was able to load the `gemma2:9b` model (100% GPU utlization). Then I ejected the eGPU and Ollama reports errors: ``` Error: llama runner process has terminated: exit status 0xc0000409 error: Cannot read C:\Users\<MY_USER_NAME>\AppData\Local\Programs\Ollama\rocm\/rocblas/library/TensileLibrary.dat: No such file or directory for GPU arch : gfx1103 ``` Re-starting Ollama fixes the issue. I assume that support for "hot-pluggable GPUs" (eGPUs) is not [yet?] implemented. ### OS * Windows * Linux ### GPU AMD ### CPU AMD ### Ollama version 0.1.48