ARM: dts: renesas: gr-peach: Remove unneeded probe-type property

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>
Link: https://lore.kernel.org/r/b2a74d02468f4032e7c3c3a90c85c5e05ebdefa7.1693481518.git.geert+renesas@glider.be

arch/arm/boot/dts/renesas/r7s72100-gr-peach.dts

@@ -36,7 +36,6 @@ lbsc {
 
 	flash@18000000 {
 		compatible = "mtd-rom";
-		probe-type = "map_rom";
 		reg = <0x18000000 0x00800000>;
 		bank-width = <4>;
 		device-width = <1>;