mtip32xx: fix crash on surprise removal of the drive

pci and block layers have changed a lot compared to when SRSI support was added.
Given the current state of pci and block layers, this driver do not have to do
any specific handling.

Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Selvan Mani <smani@micron.com>
Signed-off-by: Jens Axboe <axboe@fb.com>