audio policy: broadcast device connect event before refreshing profiles

This patch broadcasts the connect device event before checking and reloading
capabilities of profiles.
It allows the HAL implementor to use connect / disconnect event to respectively
load / reset capabilities of devices that has dynamic capabilities (e.g. HDMI).

Change-Id: Ie0533da25fed89cb9e5bbfc5b1fc886b3176837d

Signed-off-by: François Gaffie <francois.gaffie@intel.com>