ARM: dts: msm: Allow USB BAM threshold override for msmkrypton

Due to ZLT issue with USB 3.0 core, BAM threshold need to be set
to max packet size value. After setting the threshold, USB core
will not be notified on ZLT.

Change-Id: Iae2e4481b10eaf6cf48c23916bd2de440d33896e
Signed-off-by: Bar Weiner <bweiner@codeaurora.org>