xxnet: wireless: bcmdhd: Set MAX_DTIM_ALLOWED_INTERVAL to 600

Change-Id: Ie4d9cac1e0828651a142d64762b251537431ea99
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/net/wireless/bcmdhd/dhd.h