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/cpu/arm926ejs/mxs/spl_boot.c b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
index 83dd8b6..565392e 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <config.h>
 #include <init.h>
+#include <log.h>
 #include <serial.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>