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/mdio_mux_i2creg.c b/drivers/net/mdio_mux_i2creg.c
index 3e82898..cc02b5f 100644
--- a/drivers/net/mdio_mux_i2creg.c
+++ b/drivers/net/mdio_mux_i2creg.c
@@ -6,6 +6,7 @@
 
 #include <dm.h>
 #include <errno.h>
+#include <log.h>
 #include <miiphy.h>
 #include <i2c.h>