plugin/configure.ac: Change '--enable-simulator-smdb' to '--enable-simulated-smdb'

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Sasha Kotchubievsky <sashakot@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>