msm: msm_bus: Aggports property not propogated to node

The num_aggports property which is used to is bus aggregation was
not being correctly propogated after the OF node parsing which could
lead to incorrect aggregation property.

Change-Id: I84964720493c8f82d2bacde86fe6ed4c693cdacb
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>