vmgenid: emit uevent when VMGENID updates

We receive an ACPI notification every time the VM Generation ID changes
and use the new ID as fresh randomness added to the entropy pool. This
commits emits a uevent every time we receive the ACPI notification, as a
means to notify the user space that it now is in a new VM.

Signed-off-by: Babis Chalios <bchalios@amazon.es>
Reviewed-by: Alexander Graf <graf@amazon.com>
Reviewed-by: Lennart Poettering <mzxreary@0pointer.de>
Link: https://lore.kernel.org/r/20230531095119.11202-2-bchalios@amazon.es
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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