ARM: dts: imx: update snvs to use syscon access register

snvs is MFP device. Change dts to use syscon to allocate register resource.
snvs power off also switch to common syscon-poweroff

Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
4 files changed