arm64: dts: imx8-apalis-v1.1: drop ci-disable-lpm

This is an NXP downstream property. And no binding doc, and no
driver use this property. So drop it

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>