ARM: davinci_all_defconfig: enable the mstpri and ddrctl drivers

With the da8xx memory controller and master peripheral priority
drivers merged and corresponding device tree changes in place we can
now enable appropriate options by default.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>