common: use reverse_bytes from litex.gen

liteeth/common.py

@@ -2,6 +2,8 @@ from math import ceil
 
 from migen import *
 
+from litex.gen import *
+
 from litex.soc.interconnect import stream
 from litex.soc.interconnect.stream import EndpointDescription
 from litex.soc.interconnect.csr import *
@@ -9,14 +11,6 @@ from litex.soc.interconnect.csr import *
 from litex.soc.interconnect.stream_packet import Header, HeaderField
 
 
-def reverse_bytes(signal):
-    n = (len(signal)+7)//8
-    r = []
-    for i in reversed(range(n)):
-        r.append(signal[i*8:min((i+1)*8, len(signal))])
-    return Cat(*r)
-
-
 class Port:
     def connect(self, port):
         r = [self.source.connect(port.sink),