msm: camera: Avoid memory corruption in actuator start routine

When actuator is initialize for first time reg_tbl and step_position
table pointers are pointed to junk and can't call for memory free.
call for memory free only when actuator is already powered up.

Change-Id: I1fc7d0ed5ad904f9d532651b0468073fd75c284e
Signed-off-by: Lokesh Kumar Aakulu <lkumar@codeaurora.org>