ARM: shmobile: defconfig: Remove MACH_GENMAI

The CONFIG_MACH_GENMAI is scheduled for removal so remove it from
shmobile_defconfig.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
[horms+renesas@verge.net.au: revised changelog for updated commit order]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/shmobile_defconfig

@@ -14,7 +14,6 @@ CONFIG_ARCH_R7S72100=y
 CONFIG_ARCH_R8A7779=y
 CONFIG_ARCH_R8A7790=y
 CONFIG_ARCH_R8A7791=y
-CONFIG_MACH_GENMAI=y
 CONFIG_MACH_KOELSCH=y
 CONFIG_MACH_LAGER=y
 CONFIG_MACH_MARZEN=y