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/arm/w90p910_ether.c b/drivers/net/arm/w90p910_ether.c
index 4545d5a..bfea499 100644
--- a/drivers/net/arm/w90p910_ether.c
+++ b/drivers/net/arm/w90p910_ether.c
@@ -117,7 +117,7 @@
 #define TX_DESC_SIZE		10
 #define MAX_RBUFF_SZ		0x600
 #define MAX_TBUFF_SZ		0x600
-#define TX_TIMEOUT		50
+#define TX_TIMEOUT		(HZ/2)
 #define DELAY			1000
 #define CAM0			0x0