arm64: dts: imx8mm-verdin: Link reg_usdhc2_vqmmc to usdhc2

arm64: dts: imx8mm-verdin: Link reg_usdhc2_vqmmc to usdhc2

Define vqmmc regulator-gpio for usdhc2 with vin-supply
coming from LDO5.

Without this definition LDO5 will be powered down, disabling
SD card after bootup. This has been introduced in commit
f5aab0438ef1 ("regulator: pca9450: Fix enable register for LDO5").

Fixes: 6a57f224f734 ("arm64: dts: freescale: add initial support for verdin imx8m mini")
Fixes: f5aab0438ef1 ("regulator: pca9450: Fix enable register for LDO5")
Tested-by: Manuel Traut <manuel.traut@mt.com>
Reviewed-by: Philippe Schenker <philippe.schenker@impulsing.ch>
Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Cc: stable@vger.kernel.org
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@mt.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>