ARM: shmobile: r7s72100: Remove r7s72100-genmai.dtb for ARCH_SHMOBILE_LEGACY

Forgotten by commit ad8c3af8 ("ARM: shmobile: r7s72100: Remove
legacy board support").
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/Makefile

@@ -376,7 +376,7 @@ dtb-$(CONFIG_ARCH_S5PV210) += s5pv210-aquila.dtb \
 	s5pv210-smdkc110.dtb \
 	s5pv210-smdkv210.dtb \
 	s5pv210-torbreck.dtb
-dtb-$(CONFIG_ARCH_SHMOBILE_LEGACY) += r7s72100-genmai.dtb \
+dtb-$(CONFIG_ARCH_SHMOBILE_LEGACY) += \
 	r8a73a4-ape6evm.dtb \
 	r8a73a4-ape6evm-reference.dtb \
 	r8a7740-armadillo800eva.dtb \