lib/librte_table: add hash function headers

lib/librte_table: add hash function headers

This commit adds rte_table_hash_func.h and rte_table_hash_func_arm64.h to
librte_table. This reduces code duplication by removing duplicate header
files within two folders and consolidating them into a single one. This
also adds a scalar implementation of the x86_64 intrinsic for crc32 as a
generic fallback.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
Acked-by: Gavin Hu <gavin.hu@arm.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>