ethdev: support TM for shaper config in packet mode

ethdev: support TM for shaper config in packet mode

Some NIC hardware support shaper to work in packet mode i.e
shaping or ratelimiting traffic is in packets per second (PPS) as
opposed to default bytes per second (BPS). Hence this patch
adds support to configure shared or private shaper in packet mode,
provide rate in PPS and add related tm capabilities in port/level/node
capability structures.

This patch also updates tm port/level/node capability structures with
exiting features of scheduler wfq packet mode, scheduler wfq byte mode
and private/shared shaper byte mode.

SoftNIC PMD is also updated with new capabilities.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>