ice: warn about potentially malicious VFs

Attempt to detect malicious VFs and, if suspected, log the information but
keep going to allow the user to take any desired actions.

Potentially malicious VFs are identified by checking if the VFs are
transmitting too many messages via the PF-VF mailbox which could cause an
overflow of this channel resulting in denial of service. This is done by
creating a snapshot or static capture of the mailbox buffer which can be
traversed and in which the messages sent by VFs are tracked.

Co-developed-by: Yashaswini Raghuram Prathivadi Bhayankaram <[email protected]>
Signed-off-by: Yashaswini Raghuram Prathivadi Bhayankaram <[email protected]>
Co-developed-by: Paul M Stillwell Jr <[email protected]>
Signed-off-by: Paul M Stillwell Jr <[email protected]>
Co-developed-by: Brett Creeley <[email protected]>
Signed-off-by: Brett Creeley <[email protected]>
Signed-off-by: Vignesh Sridhar <[email protected]>
Tested-by: Konrad Jankowski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

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