msm: camera: req_mgr: Enhance camera v4l2 subdev shutdown sequence

when provider crash occurred, there was a CSID lane overflow
observed due to shutdown sequence from CRM(sensor, csid, csiphy).
To fix the issue need to change the shutdown sequence
(csid, sensor, csiphy).

This change will update the devices sequence in order while registering
and close the sequence accordingly.

CRs-Fixed: 2852076
Change-Id: Ia6d8022e995823bf031400c33528eb8544dc2e29
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>

drivers/cam_cust/cam_custom_context.h

@@ -150,4 +150,16 @@ int cam_custom_dev_context_init(struct cam_custom_context *ctx,
  */
 int cam_custom_dev_context_deinit(struct cam_custom_context *ctx);
 
+/**
+ * cam_custom_subdev_close_internal()
+ *
+ * @brief:               Close function for the Custom context
+ *
+ * @sd:                  Pointer to struct v4l2_subdev
+ * @fh:                  Pointer to struct v4l2_subdev_fh
+ *
+ */
+int cam_custom_subdev_close_internal(struct v4l2_subdev *sd,
+	struct v4l2_subdev_fh *fh);
+
 #endif  /* _CAM_CUSTOM_CONTEXT_H_ */