Update GetMigConfig to use GIProfileID from target device

[JunAr7112]

This MR is in response to this issue: #157. Essentially the issue we are seeing is that SetMigConfig(gpu, config) resolves MIG profile strings (e.g. "1g.6gb") to GIProfileID values globally across all GPUs, not from the target device. As such, if the GIProfileID of a partition in GPU 0 differs from the GIProfileID of a partition in GPU 1, the mig manager will error: Error getting GPU instance profile info for '1g.6gb': ERROR_NOT_SUPPORTED"

To fix this, a helper function resolveMigProfileOnDevice was created that will map a logical MIG profile (from config / Flatten) to the NVML GI/CI profile IDs for the given GPU. It will loop through the profiles in GetMigProfiles() and identify the profile that matches the mp.String() we are trying to create. We will then update with the correct profile info.

In order to test this change, func TestSetMigConfigResolvesMigProfileOnTargetGPU was defined. The function will create two dummy GPUs, and override the GI Profile ID for GPU 1.

local-agadiyar@ipp2-0139:~/mig-parted$ go test ./pkg/mig/config -run TestSetMigConfigResolvesMigProfileOnTargetGPU -count=1
ok github.com/NVIDIA/mig-parted/pkg/mig/config 0.008s

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