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/pic32_eth.c b/drivers/net/pic32_eth.c
index e966be0..d367a1f 100644
--- a/drivers/net/pic32_eth.c
+++ b/drivers/net/pic32_eth.c
@@ -7,6 +7,7 @@
 #include <cpu_func.h>
 #include <errno.h>
 #include <dm.h>
+#include <log.h>
 #include <malloc.h>
 #include <net.h>
 #include <miiphy.h>