msm: ipa: tethering bridge: setup HW bridge ASAP

After link protocol and aggregation parameters are known, in the case
of IP link protocol, setup the HW bridge immediately, without waiting
for packets to flow through the SW bridge.

Change-Id: I2c6d43fee67ffe45447f58d9ecc7da374fdedfbd
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>