megaraid_sas: Print critical firmware event messages

megaraid_sas: Print critical firmware event messages

Print firmware events in human-readable form. This will help users track
any critical firmware events without special application support.

Sample syslogd output:

megaraid_sas 0000:02:00.0: 8619 (491648347s/0x0020/WARN) - Controller temperature threshold exceeded. This may indicate inadequate system cooling. Switching to low performance mode.

The format of logged events is:

"<pci_dev_id>: <sequence_number> (<timestamp>/<locale>/<class>) - <description>"

Signed-off-by: Sumit Saxena <[email protected]>
Signed-off-by: Kashyap Desai <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>