wl12xx: Set End-of-transaction Flag at Wl127x AP Mode

End-of-transaction flag should be set when working with
wl127x chip on AP mode.

Thanks Ido Yariv <ido@wizery.com> for the guidance with that.

Signed-off-by: Shahar Levi <shahar_levi@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>