QCamera2: State Machine - AF during capture

if receive AF start in preview stopped state (usualy during
capture post process) do not return error - it cuases exeption
throw in java application. Just do nothing

Change-Id: I02ad7e762b19da71250c9c7be306e3074217a029
diff --git a/QCamera2/HAL/QCameraStateMachine.cpp b/QCamera2/HAL/QCameraStateMachine.cpp
index b3d2f91..a715594 100644
--- a/QCamera2/HAL/QCameraStateMachine.cpp
+++ b/QCamera2/HAL/QCameraStateMachine.cpp
@@ -490,7 +490,6 @@
     case QCAMERA_SM_EVT_RELEASE_RECORIDNG_FRAME:
     case QCAMERA_SM_EVT_PREPARE_SNAPSHOT:
     case QCAMERA_SM_EVT_TAKE_PICTURE:
-    case QCAMERA_SM_EVT_START_AUTO_FOCUS:
         {
             ALOGE("%s: cannot handle evt(%d) in state(%d)", __func__, evt, m_state);
             rc = INVALID_OPERATION;
@@ -500,6 +499,7 @@
             m_parent->signalAPIResult(&result);
         }
         break;
+    case QCAMERA_SM_EVT_START_AUTO_FOCUS:
     case QCAMERA_SM_EVT_CANCEL_PICTURE:
         {
             // no op needed here