msm: ipa: add support for Ethernet Bridging

Add support for new IPA feature for enabling Ethernet bridging.
This includes changes in filtering or routing attributes
and header insertion.

Filtering changes includes adding filtering or routing rules
with attributes from Ethernet header such as source and
destination mac addresses.

Header insertion changes includes adding new API
for adding Processing Contexts to IPA
to allow Ethernet header insertion and processing.

Change-Id: I7fcc8146c06fc306548e67554a3c3c6c8d7cad1e
Acked-by: Yaniv Lefel <ylefel@qti.qualcomm.com>
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>
Signed-off-by: Ravit Katzav <rkatzav@codeaurora.org>