ARM: davinci: remove intc_host_map from davinci_soc_info struct

The intc_host_map field in struct davinci_soc_info is not used by any
board. Remove it as part of the interrupt support cleanup.

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