ssa_prdb.h: adding PRDB header

Signed-off-by: Sasha Kotchubievsky <sashakot@mellanox.com>
Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>
Add ssa_prdb.h link in acm directory

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
Add ssa_prdb.h link in distrib directory

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