net: move TCP flags from ethdev header

net: move TCP flags from ethdev header

TCP flags were moved to the TCP header file from the Ethernet control
header file, and the RTE prefix was added to their names.

Missing TCP ECN flags were added.

The ALL mask did not include TCP ECN flags, so it was renamed to reflect
that it applies to N-tuple filtering only.

Updated other files affected by the renaming accordingly.

Signed-off-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>