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/ddr/fsl/mpc85xx_ddr_gen3.c b/drivers/ddr/fsl/mpc85xx_ddr_gen3.c
index a9b085d..c6e983b 100644
--- a/drivers/ddr/fsl/mpc85xx_ddr_gen3.c
+++ b/drivers/ddr/fsl/mpc85xx_ddr_gen3.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <asm/io.h>
 #include <fsl_ddr_sdram.h>
 #include <asm/processor.h>