ARM: dts: imx6qdl: SolidRun: move AR8035 into microsom

As all SolidRun microsoms are fitted with an AR8035, it's pointless
having the ethernet support as a separate include file.  Move the
AR8035 support into the main imx6qdl-microsom file.

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>