Address several NVRAM access issues:

     o Add support for write-protected NVRAM chips used with
       ISP2322 and ISP6322.
     o Correct code to not perform an erase data during NVRAM
       update.
     o Correct issuance of NVRAM delay after PCI posting call.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>