ssa_smdb.[c h]: move ssa_smdb xxx_rec_init() methods to 'ssa_smdb_api.h'

xxx_rec_init() methods that are used to initialize
'ssa_smdb' records were moved from 'ssa_smdb.h' to
'ssa_smdb_api.h' header in order to eliminate 'osm_headers.h'
dependency in 'ssa_smdb.h'

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