aco: propagate p_wqm on an image_sample's coordinate p_create_vector

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2156


Fixes: 93c8ebfa ('aco: Initial commit of independent AMD compiler')
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
(cherry picked from commit ff70ccad)