cxgb4: Fixed the code to use correct length for part number
cxgb4: Fixed the code to use correct length for part number

Previously it was using the length value of serial number.
Also added macro for VPD unique identifier (0x82).

Signed-off-by: Casey Leedom <dcfbcb54931b10a0f02f8363358ec242f10c17f5@chelsio.com>
Signed-off-by: Hariprasad Shenai <5dd26741d612710d1bda6f7e0b02a31f31113b34@chelsio.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs