diag: Add functionality to close SDIO channel.

DIAG driver pulls MDM9k traffic onto MSM using the SDIO bridge.
This patch adds capability to close this channel under special
circumstances.

Signed-off-by: Shalabh Jain <shalabhj@codeaurora.org>
diff --git a/drivers/char/diag/diagchar.h b/drivers/char/diag/diagchar.h
index 6041954..5c685c3 100644
--- a/drivers/char/diag/diagchar.h
+++ b/drivers/char/diag/diagchar.h
@@ -213,6 +213,7 @@
 	struct workqueue_struct *diag_sdio_wq;
 	struct work_struct diag_read_sdio_work;
 	struct work_struct diag_remove_sdio_work;
+	struct work_struct diag_close_sdio_work;
 	struct diag_request *usb_read_mdm_ptr;
 	struct diag_request *write_ptr_mdm;
 #endif