usb: bam: Store memory buffers info for future queries

In order to configure USB EP with a specific pipe, the
data and descriptors memory buffers are required. To
retrieve this information using get_bam2bam_connection_info()
we must store this information when the pipes are connected.

Change-Id: I422d491be38a65da5888b8a2c111b155b754b6e2
Signed-off-by: Bar Weiner <bweiner@codeaurora.org>