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/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c b/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c
index c4c4154..111692f 100644
--- a/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/mpc8536_serdes.c
@@ -6,6 +6,7 @@
 
 #include <config.h>
 #include <common.h>
+#include <log.h>
 #include <asm/io.h>
 #include <asm/immap_85xx.h>
 #include <asm/fsl_serdes.h>