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/netconsole.c b/drivers/net/netconsole.c
index 73005ff..f1d0630 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <command.h>
 #include <env.h>
+#include <log.h>
 #include <stdio_dev.h>
 #include <net.h>