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/lib/rsa/rsa-mod-exp.c b/lib/rsa/rsa-mod-exp.c
index 62b2557..a437cbe 100644
--- a/lib/rsa/rsa-mod-exp.c
+++ b/lib/rsa/rsa-mod-exp.c
@@ -6,6 +6,7 @@
 #ifndef USE_HOSTCC
 #include <common.h>
 #include <fdtdec.h>
+#include <log.h>
 #include <asm/types.h>
 #include <asm/byteorder.h>
 #include <linux/errno.h>