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/arm/mach-imx/imx8/iomux.c b/arch/arm/mach-imx/imx8/iomux.c
index 0ade85f..b8e6f48 100644
--- a/arch/arm/mach-imx/imx8/iomux.c
+++ b/arch/arm/mach-imx/imx8/iomux.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <asm/io.h>
 #include <asm/arch/iomux.h>
 #include <asm/arch/sci/sci.h>