ARM: davinci: cp-intc: convert all hex numbers to lowercase

Use lowercase letters in hexadecimal numbers in the cp-intc driver as
is done in most of the kernel code base.

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