mxs-bootloader: Barebox entry point symbol changed in 2012.08

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

boot/mxs-bootlets/barebox_ivt.bd

@@ -28,7 +28,7 @@ section (0) {
 	//----------------------------------------------------------
 
         load barebox;
-        load ivt (entry = barebox:exception_vectors) > 0x8000;
+        load ivt (entry = barebox:start) > 0x8000;
 	hab call 0x8000;
 
 }