msm: ipa: teth_bridge: invalidate Ethernet mode with MBIM aggr

HW does not support Ethernet link protocol with MBIM aggregation.
Return an error when this configuration is being requested.

Change-Id: Ia1f3d6875287860db2f877a63191193b5fe49e8b
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>