[SCSI] mptfusion: mptscsih Split driver support

(1) mptscsih.c: Remove credits, -sralston references , update copyright 
(2) mptscsih.c: split driver support
(3) mptscsih.c: module_init, module_exit, and probe routines moved to new 
stub drivers, mptfc and mptspi
(4) mptscsih.c: some global parameters are moved to MPT_SCSI_HOST
(5) mptscsih.c: removed scsi_device_online check.

Signed-off-by: Eric Moore <Eric.Moore@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>