ARM: dts: imx6qdl-gw5903: Use new CODEC reset pin name

The correct DT property for specifying a GPIO used for reset
is "reset-gpios", the driver now accepts this name, use it here.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>