mips: dts: ingenic: Remove unneeded probe-type properties

The "probe-type" property was only needed when used with the
(long obsolete) "direct-mapped" compatible value.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>