cxgb4: Remove unused cxgb4_scsi_init

cxgb4_iscsi_init() has been unused since 2016's commit
5999299f ("cxgb3i,cxgb4i,libcxgbi: remove iSCSI DDP support")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://patch.msgid.link/20241013203831.88051-5-linux@treblig.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>