Make gensdbfs support the file order. sdb files should starts with xxfilename,
like 00wr-init. (In gensdbfs.c, I change the readdir() to scandir())
   Add two sdb files on 0x2e0000 to support the dualport's calibration and sfp
database. (db-calibration and db-sfp-database)
   Bug fix in shell/cmd_sfp.c.

   Now the one WR port function works well.