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/common/spl/spl_sdp.c b/common/spl/spl_sdp.c
index 644dfa8..e7f7b68 100644
--- a/common/spl/spl_sdp.c
+++ b/common/spl/spl_sdp.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <spl.h>
 #include <usb.h>
 #include <g_dnl.h>