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/gpio/sh_pfc.c b/drivers/gpio/sh_pfc.c
index 6320a62..0b412c2 100644
--- a/drivers/gpio/sh_pfc.c
+++ b/drivers/gpio/sh_pfc.c
@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <malloc.h>
 #include <asm/bitops.h>
 #include <asm/io.h>