drm/vc4: Convert timers to use timer_setup()

drm/vc4: 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: Eric Anholt <[email protected]>
Cc: David Airlie <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Eric Anholt <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024151648.GA104538@beast
Reviewed-by: Eric Anholt <[email protected]>