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/x86/cpu/slimbootloader/slimbootloader.c b/arch/x86/cpu/slimbootloader/slimbootloader.c
index 889fba5..f61fe81 100644
--- a/arch/x86/cpu/slimbootloader/slimbootloader.c
+++ b/arch/x86/cpu/slimbootloader/slimbootloader.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <cpu_func.h>
 #include <init.h>
+#include <log.h>
 #include <asm/arch/slimbootloader.h>
 
 DECLARE_GLOBAL_DATA_PTR;