net: qualcomm: rmnet: Move rmnet_mode to rmnet_port

Mode information on the real device makes it easier to route packets
to rmnet device or bridged device based on the configuration.

CRs-Fixed: 2156182
Change-Id: Ic4df07c575d22eb9c4d58217a2ee5c085794c8ea
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: 9148963201a4627a632d2c769805c9278f6d22d7
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>