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/mailbox/stm32-ipcc.c b/drivers/mailbox/stm32-ipcc.c
index 13e642a..0778eb5 100644
--- a/drivers/mailbox/stm32-ipcc.c
+++ b/drivers/mailbox/stm32-ipcc.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <clk.h>
 #include <dm.h>
+#include <log.h>
 #include <mailbox-uclass.h>
 #include <malloc.h>
 #include <asm/io.h>