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/i2c/davinci_i2c.c b/drivers/i2c/davinci_i2c.c
index edc40f7..f41ea01 100644
--- a/drivers/i2c/davinci_i2c.c
+++ b/drivers/i2c/davinci_i2c.c
@@ -14,6 +14,7 @@
 #include <common.h>
 #include <i2c.h>
 #include <dm.h>
+#include <log.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/i2c_defs.h>
 #include <asm/io.h>