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/cmd/setexpr.c b/cmd/setexpr.c
index 1d81ecf..770dc24 100644
--- a/cmd/setexpr.c
+++ b/cmd/setexpr.c
@@ -12,6 +12,7 @@
 #include <config.h>
 #include <command.h>
 #include <env.h>
+#include <log.h>
 #include <mapmem.h>
 
 static ulong get_arg(char *s, int w)