All of the currently known MStar/SigmaStar ARMv7 SoCs have at least
one MPLL and it seems to always be at the same place so add it to
the base dtsi.
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Link: https://lore.kernel.org/r/20210301123542.2800643-4-daniel@0x0f.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>