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/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index 65f909f..55f191f 100644
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <clock_legacy.h>
 #include <env.h>
+#include <log.h>
 #include <time.h>
 #include <linux/libfdt.h>
 #include <fdt_support.h>