drivers/net: normalize TX_TIMEOUT

Some network drivers use old TX_TIMEOUT definitions, assuming HZ=100 of
old kernels.

Convert these definitions to include HZ, since HZ can be 1000 these
days.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/3c507.c b/drivers/net/3c507.c
index ea9b7a0..475a66d9 100644
--- a/drivers/net/3c507.c
+++ b/drivers/net/3c507.c
@@ -201,7 +201,7 @@
 #define RX_BUF_SIZE 	(1518+14+18)	/* packet+header+RBD */
 #define RX_BUF_END		(dev->mem_end - dev->mem_start)
 
-#define TX_TIMEOUT 5
+#define TX_TIMEOUT (HZ/20)
 
 /*
   That's it: only 86 bytes to set up the beast, including every extra