MLK-21117-2 arm64: dts: imx8mm: Use upstream bd718x7 pmic driver

MLK-21117-2 arm64: dts: imx8mm: Use upstream bd718x7 pmic driver

The upstream bd718x7 is usable but has slightly different DT bindings:

- Update compatible to bd71847 (chip found on newer boards)
- Use standard interrupt bindings instead of gpio_into
- Use uppercase names for regulator-compatible
- Use rohm,reset-snvs-powered and rohm,dvs-*
- Rename BUCK5/6/7/8 relative to datasheet just like upstream driver

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Acked-by: Robin Gong <yibin.gong@nxp.com>