arm64: Move Azure-specific config from std.hyperv to std.azure

Hyper-V does not provide Mellanox hardware, some of Azure's instances
do, thus the configuration to enable them does not belong in the

arm64: Move Azure-specific config from std.hyperv to std.azure

Hyper-V does not provide Mellanox hardware, some of Azure's instances
do, thus the configuration to enable them does not belong in the generic
std.hyperv config.

Fixes: 15e7fa83ef3c ("arm64: Hyper-V: Add vPCI and Mellanox driver modules into build")

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