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/ivybridge/model_206ax.c b/arch/x86/cpu/ivybridge/model_206ax.c
index 56ab6bf..5954a24 100644
--- a/arch/x86/cpu/ivybridge/model_206ax.c
+++ b/arch/x86/cpu/ivybridge/model_206ax.c
@@ -10,6 +10,7 @@
 #include <cpu.h>
 #include <dm.h>
 #include <fdtdec.h>
+#include <log.h>
 #include <malloc.h>
 #include <asm/cpu.h>
 #include <asm/cpu_common.h>