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/sun8i_emac.c b/drivers/net/sun8i_emac.c
index 09ea586..c24ab83 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -11,6 +11,7 @@
 */
 
 #include <cpu_func.h>
+#include <log.h>
 #include <asm/cache.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>