common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/ep93xx_eth.c b/drivers/net/ep93xx_eth.c
index 8ec7b36..5aed164 100644
--- a/drivers/net/ep93xx_eth.c
+++ b/drivers/net/ep93xx_eth.c
@@ -18,6 +18,7 @@
 
 #include <command.h>
 #include <common.h>
+#include <log.h>
 #include <net.h>
 #include <asm/arch/ep93xx.h>
 #include <asm/io.h>