ARM: dts: imx6qdl: SolidRun: remove redundant regulators node

The regulators node is redundant, and serves no useful function.
Remove it from i.MX6 SolidRun platforms.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>