ARM: mstar: Select MSTAR_MSC313_MPLL

All of the ARCH_MSTARV7 chips have an MPLL as the source for
peripheral clocks so select MSTAR_MSC313_MPLL.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20210301123542.2800643-2-daniel@0x0f.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>