scsi: megaraid_sas: replace instance->ctrl_context checks with instance->adapter_type

scsi: megaraid_sas: replace instance->ctrl_context checks with instance->adapter_type

Increase code readability. No functional change.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Orabug: 27625001
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>