FG:fixed fg can't probe success

when ima_hw_sts=c in fg_check_ima_exception function, FG will
clear sequence by fg_run_iacs_clear_sequence. But return -EAGAIN
when success clear sequence. So FG can't probe success.

[    1.070761,5] FG: fg_check_ima_exception: Initial ima_err_sts=0
ima_exp_sts=0 ima_hw_sts=c
[    1.070770,5] FG: fg_check_ima_exception: IMA HW not in correct
state, hw_sts=c
[    1.070834,5] FG: fg_memif_init: Error in clearing IMA exception
rc=-11
[    1.070839,5] FG: fg_probe: Unable to setup mem_if offsets rc=-11
[    1.256763,0] qcom,qpnp-fg: probe of qpnp-fg-18 failed with error -11

Change-Id: I376912218c18ceb333ce6d9cf829ec9332449ea4
Signed-off-by: Haijian Ma <mahj8@motorola.com>
Reviewed-on: https://gerrit.mot.com/1086396


SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Reviewed-by: Kenneth Kessler <kennykessler@motorola.com>
Submit-Approved: Jira Key