qcacmn: Add WIN Driver compilation fix.

Fix compilation errors for WIN driver.

Change-Id: Iae6201b06c3b9931f3f6af78c2e1691755b8bcf7
CRs-Fixed: 981187

qdf/inc/qdf_util.h

@@ -71,6 +71,20 @@
  */
 #define qdf_target_assert_always(expr)  __qdf_target_assert(expr)
 
+/**
+ * QDF_MAX - get maximum of two values
+ * @_x: 1st arguement
+ * @_y: 2nd arguement
+ */
+#define QDF_MAX(_x, _y) (((_x) > (_y)) ? (_x) : (_y))
+
+/**
+ * QDF_MIN - get minimum of two values
+ * @_x: 1st arguement
+ * @_y: 2nd arguement
+ */
+#define QDF_MIN(_x, _y) (((_x) < (_y)) ? (_x) : (_y))
+
 /**
  * qdf_status_to_os_return - returns the status to OS.
  * @status: enum QDF_STATUS