Get rid of deprecation warning.

Author: bl0x

amaranth_boards/cmod_a7.py

@@ -2,7 +2,7 @@
 import subprocess
 
 from amaranth.build import *
-from amaranth.vendor.xilinx_7series import *
+from amaranth.vendor.xilinx import *
 from .resources import *
 
 """