ARM: davinci: pull davinci_intc_base into the respective intc drivers

davinci_intc_base is defined globally in common.c. Define separate
local variables for the aintc and cp-intc drivers and remove the
global one.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>