QCamera2: Add flash device name info

Add flash device name into capability

Change-Id: Iabe9a557162d038a57647febf23457c7080cb3bc
diff --git a/camera/QCamera2/stack/common/cam_intf.h b/camera/QCamera2/stack/common/cam_intf.h
index c61d277..82d0757 100644
--- a/camera/QCamera2/stack/common/cam_intf.h
+++ b/camera/QCamera2/stack/common/cam_intf.h
@@ -340,6 +340,8 @@
 
     /* Max size supported by ISP viewfinder path */
     cam_dimension_t max_viewfinder_size;
+
+    uint8_t flash_dev_name[QCAMERA_MAX_FILEPATH_LENGTH];
 } cam_capability_t;
 
 typedef enum {