mempool/octeontx2: add devargs for max pool selection

mempool/octeontx2: add devargs for max pool selection

The maximum number of mempools per application needs to be configured
on HW during mempool driver initialization. HW can support up to 1M
mempools, Since each mempool costs set of HW resources, the max_pools
devargs parameter is being introduced to configure the number of
mempools required for the application.
For example:

-w 0002:02:00.0,max_pools=512

With the above configuration, the driver will set up only 512 mempools
for the given application to save HW resources.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Harman Kalra <hkalra@marvell.com>