mfd: axp20x: Enable AXP22X regulators

Now that the axp20x-regulators driver supports different variants of the
AXP family, we can enable regulator support for AXP22X without the risk
of incorrectly configuring regulators.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/axp20x.c

@@ -370,6 +370,8 @@ static struct mfd_cell axp22x_cells[] = {
 		.name			= "axp20x-pek",
 		.num_resources		= ARRAY_SIZE(axp22x_pek_resources),
 		.resources		= axp22x_pek_resources,
+	}, {
+		.name			= "axp20x-regulator",
 	},
 };