arm64: dts: imx8mm-evk: fix missing PMIC's interrupt line pull-up

arm64: dts: imx8mm-evk: fix missing PMIC's interrupt line pull-up

The PMIC's interrupt is level low and should be pulled up.  The PMIC's
device node had pinctrl-0 property but it lacked pinctrl-names which
is required to apply the pin configuration.

Fixes: 5f67317bd967 ("arm64: dts: imx8mm: correct interrupt flags")
Fixes: aa71d0648318 ("arm64: dts: imx8mm: Split the imx8mm evk board dts to a common dtsi")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>