msm: camera: isp: Config hardware in work queue

Currently requests for offline IFE are applied from tasklet
context or from an ioctl thread within a critical section
protected by a spinlock. In both of these cases, preemtion is
disabled but CDM requires mutex locks during this operation.
Therefore a work queue is added in this change to handle
apply request for offline IFE.

CRs-Fixed: 2606911
Change-Id: Ie893a626bc274d026fb878f1f19830e990be6dc6
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>

drivers/cam_isp/cam_isp_context.h

@@ -14,7 +14,7 @@
 
 #include "cam_context.h"
 #include "cam_isp_hw_mgr_intf.h"
-
+#include "cam_req_mgr_workq.h"
 
 #define CAM_IFE_QTIMER_MUL_FACTOR        10000
 #define CAM_IFE_QTIMER_DIV_FACTOR        192
@@ -257,6 +257,7 @@ struct cam_isp_context_event_record {
  * @isp_device_type:           ISP device type
  * @rxd_epoch:                 Indicate whether epoch has been received. Used to
  *                             decide whether to apply request in offline ctx
+ * @workq:                     Worker thread for offline ife
  *
  */
 struct cam_isp_context {
@@ -298,6 +299,7 @@ struct cam_isp_context {
 	unsigned int                          init_timestamp;
 	uint32_t                              isp_device_type;
 	atomic_t                              rxd_epoch;
+	struct cam_req_mgr_core_workq        *workq;
 };
 
 /**