[SCSI] add PCI_VENDOR_ID macro for Brocade in pci_ids.h

Adds PCI_VENDOR_ID_BROCADE macro in include/linux/pci_ids.h file. This macro
is used in MPT Fusion FC drivers to support Brocade branded FC controllers

signed-off-by: Sathya Prakash <sathya.prakash@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>