ARM: sunxi: dt: Update the watchdog compatibles

The watchdog compatibles were following a different pattern than the one found
in the other devices. Now that the driver supports the right pattern, switch to
it in the DT.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --cc arch/arm/boot/dts/sun4i-a10.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun5i-a10s.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun5i-a13.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun6i-a31.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun7i-a20.dtsi
Simple merge