ssa.c: fix memory allocation for received SSA DB by upstream handler

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: In ssa_upstream_update_conn, change data_tbl_cnt type

from int to uint64_t to match ssa_db_calculate_data_tbl_num API

Signed-off-by: Hal Rosenstock <hal@mellanox.com>