dock: msm: Moved Ethernet reset and HUB reset to be optional

In the Liquid8994 we don't need the USB HUB reset and Ethernet reset
from software.

Change-Id: I577ef9d2772b46e125c6d9059834b3b2af493429
Signed-off-by: Tanya Finkel <tfinkel@codeaurora.org>