bnx2x: Search VPD with pci_vpd_find_ro_info_keyword()

Use pci_vpd_find_ro_info_keyword() to search for keywords in VPD to
simplify the code.

Use strncasecmp() to match Vendor ID instead of comparing with lower- and
upper-case hex string.

[bhelgaas: convert to strncasecmp()]
Link: https://lore.kernel.org/r/a9f730cf-e31e-902b-7b39-0ff2e99636e0@gmail.com


Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>