[SCSI] bfa: Flash Controller PLL initialization fixes

- Made changes to check the flash controller status before IOC initialization.
- Made changes to poll on the FLASH_STS_REG bit to check if the flash controller
  initialization is completed during the PLL init.

Signed-off-by: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>