targets/Ultrascale: add missing AsyncResetSynchronizer import.

litex_boards/targets/alveo_u250.py

@@ -11,6 +11,7 @@
 import argparse, os
 
 from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex_boards.platforms import alveo_u250
 

litex_boards/targets/kcu105.py

@@ -10,6 +10,7 @@ import os
 import argparse
 
 from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex_boards.platforms import kcu105
 

litex_boards/targets/mercury_xu5.py

@@ -10,7 +10,7 @@ import os
 import argparse
 
 from migen import *
-from migen.genlib.io import CRG
+from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex_boards.platforms import mercury_xu5
 

litex_boards/targets/vcu118.py

@@ -11,6 +11,7 @@ import os
 import argparse
 
 from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex_boards.platforms import vcu118
 

litex_boards/targets/xcu1525.py

@@ -10,6 +10,7 @@ import os
 import argparse
 
 from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex_boards.platforms import xcu1525
 

litex_boards/targets/zcu104.py

@@ -11,6 +11,7 @@ import os
 import argparse
 
 from migen import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex_boards.platforms import zcu104