arm64: dts: imx8mq-evk: Add hog suffix to wl-reg-on

According to device tree specification, device node names should be
somewhat generic and reflecting the function of the device so add the
"hog" suffix to wl-reg-on GPIO hog.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>