scsi: megaraid_sas: Make some functions static

Fix sparse warnings:

drivers/scsi/megaraid/megaraid_sas_fusion.c:541:1: warning: symbol 'megasas_alloc_cmdlist_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:580:1: warning: symbol 'megasas_alloc_request_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:661:1: warning: symbol 'megasas_alloc_reply_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:738:1: warning: symbol 'megasas_alloc_rdpq_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:920:1: warning: symbol 'megasas_alloc_cmds_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:1740:1: warning: symbol 'megasas_init_adapter_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:1966:1: warning: symbol 'map_cmd_status' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:2379:1: warning: symbol 'megasas_set_pd_lba' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:2718:1: warning: symbol 'megasas_build_ldio_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:3215:1: warning: symbol 'megasas_build_io_fusion' was not declared. Should it be static?
drivers/scsi/megaraid/megaraid_sas_fusion.c:3328:6: warning: symbol 'megasas_prepare_secondRaid1_IO' was not declared. Should it be static?

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>