Merge branch 'hinic-mailbox-channel-enhancement'

Luo bin says:

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hinic: mailbox channel enhancement

add support to generate mailbox random id for VF to ensure that
the mailbox message from VF is valid and PF should check whether
the cmd from VF is supported before passing it to hw.
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Signed-off-by: David S. Miller <davem@davemloft.net>