sun6i: Add clock functions needed for SPL

Add clock_init_safe and clockset_pll5 functions, as these are needed for
SPL support.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun6i: SPL hack do not set PLL1 speed for now

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun6i: Add cpucfg register definitions

Not used atm, for future use (e.g. PSCI).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun6i: Columbus: Enable SPL

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun6i: Add Mele M9 board

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun6i: Add dram controller registers header

Signed-off-by: Hans de Goede <hdegoede@redhat.com>