net: qualcomm: rmnet: Add QMAPv5 header definitions

Adds definitions for new QMAPv5 checksum offload and coalescing headers,
as well as changing the main QMAP header definition to support these
additional headers.

Change-Id: I62fdf6d8d35e8788b089156703fdf3a1d6367e5b
Acked-by: Ryan Chapman <rchapman@qti.qualcomm.com>
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>