[VOL-1635] This OpenOLT agent supports the BAL V3.0.3.3 SDK.
The APIs call,variables and structures has been changed to BAL v3.0.
OLT activation from voltha-1.7 is successful.

Change-Id: I2096251262ef515a3dbf579eca806fc551bdecf1
diff --git a/agent/src/utils.h b/agent/src/utils.h
index 53f4a99..52c018a 100644
--- a/agent/src/utils.h
+++ b/agent/src/utils.h
@@ -23,11 +23,11 @@
 extern "C"
 {
 #include <bcmos_system.h>
-#include <bal_api.h>
-#include <bal_api_end.h>
+#include <bcmolt_api.h>
+#include <bcmolt_api_model_supporting_structs.h>
 }
 
-std::string serial_number_to_str(bcmbal_serial_number* serial_number);
+std::string serial_number_to_str(bcmolt_serial_number* serial_number);
 std::string vendor_specific_to_str(const char* const serial_number);
 
 #endif