sunxi: dram: Use clock_get_pll5p to calculate mbus, rather then hardcoding

This is a preparation patch for making the pll5 "p" divisor configurable
through Kconfig.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
1 file changed