Enable the crossbar IP support for DRA7xx soc.

Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: NSricharan R <r.sricharan@ti.com>
Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>