target/iscsi: Convert timers to use timer_setup()

target/iscsi: 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. Includes a fix for correcting an
on-stack timer usage.

Cc: "Nicholas A. Bellinger" <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: Jiang Yi <[email protected]>
Cc: Varun Prakash <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-and-Tested-by: Bart Van Assche <[email protected]>
Signed-off-by: Kees Cook <[email protected]>