Vulkan: Select device with env variable, and skip initialize for unused devices. #629
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Introduces the
SD_VK_DEVICEenv variable that can be used to chose the device to run inference on.Also backend was initialized on every device for no apparent reason.
I know it was already possible to hide some devices from the Vulkan backend by setting the
GGML_VK_VISIBLE_DEVICESenv variable, but this isn't ideal, as it affects every program that uses Vulkan GGML.(Maybe the same should be done for CUDA and SYCL backends)