lmbench: update config script

      *fix bug that can not find  CONFIG file
      |error: run ./results|./results: line 15: .: CONFIG.p2041rdb: file not found
      * update CONFIG file path

Signed-off-by: Chunrong Guo <B40290@freescale.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>