MIPS: Kconfig: ingenic: Ensure MACH_INGENIC_GENERIC selects all SoCs

The MACH_INGENIC_GENERIC config option must select all SoCs, in order
for all the SoC-specific drivers to become available.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>