mempool: make stats macro generic
mempool: make stats macro generic

Make __MEMPOOL_STAT_ADD macro more generic and delete
__MEMPOOL_CONTIG_BLOCKS_STAT_ADD macro.

Suggested-by: Olivier Matz <dfcc1510895413197abb4336e39bb0a3906cba71@6wind.com>
Signed-off-by: Dharmik Thakkar <724f3610823e4b14afc73144686337ac966281c2@arm.com>
Reviewed-by: Ruifeng Wang <a548d51fbc42485a8ba807711a537e88c2b59dd2@arm.com>
Reviewed-by: Honnappa Nagarahalli <01ccf438b971cc1d8919c8a7f18443cae9429d8b@arm.com>
Acked-by: Olivier Matz <dfcc1510895413197abb4336e39bb0a3906cba71@6wind.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk