reset: imx7: Add PCIE_CTRL_APPS_TURNOFF

This is required for the imx pci driver to send the PME_Turn_Off TLP.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>