arm64: dts: mba8mx: remove undocumented 'data-lanes' at panel

arm64: dts: mba8mx: remove undocumented 'data-lanes' at panel

'data-lanes' is port0 of lvds bridge. Needn't set it for simple panel. Fix
below CHECK_DTBS warning:

arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx-lvds-tm070jvhg33.dtb:
   panel-lvds: port:endpoint: Unevaluated properties are not allowed ('data-lanes' was unexpected)
       from schema $id: http://devicetree.org/schemas/display/panel/panel-simple.yaml#

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>