octeontx2-af: Dynamically allocate bpids for CPT and LBK

commit bd1c42c0c8ef39b29ca2a1795984ecc44c7d9151 from
git@git.assembla.com:cavium/WindRiver.linux.git

This patch dynamically allocates the BPIDs from the free pool.
It also reduces the BPIDs reserved to CGX LMAC to 8.

Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Change-Id: I3228e9ccbf7755508d1678f8913657ca29108368
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/91349
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Nithin Kumar Dabilpuram <ndabilpuram@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>