ARM: dts: sun8i: h3: fix ALL-H3-CC H3 ver VCC-1V2 regulator voltage

The voltage of the VCC-1V2 regulator on the ALL-H3-CC H3 ver. should be
1.2V, not the 3.3V currently defined in the device tree.

Fix the voltage in the device tree.

Fixes: 6ca35864 ("ARM: dts: sun8i: h3: Add dts file for Libre
		      Computer Board ALL-H3-CC H3 ver.")
Cc: <stable@vger.kernel.org> # 4.16.x
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>