scsi: libiscsi: Convert timers to use timer_setup()

scsi: libiscsi: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Lee Duncan <[email protected]>
Cc: Chris Leech <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: "Martin K. Petersen" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Reviewed-by: Chris Leech <[email protected]>