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/rtc/davinci.c b/drivers/rtc/davinci.c
index b6930bd..3514e73 100644
--- a/drivers/rtc/davinci.c
+++ b/drivers/rtc/davinci.c
@@ -5,6 +5,7 @@
  */
 #include <common.h>
 #include <command.h>
+#include <log.h>
 #include <rtc.h>
 #include <asm/io.h>
 #include <asm/davinci_rtc.h>