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/efi_loader/efi_rng.c b/lib/efi_loader/efi_rng.c
index a1d0ec8..caef408 100644
--- a/lib/efi_loader/efi_rng.c
+++ b/lib/efi_loader/efi_rng.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <efi_loader.h>
 #include <efi_rng.h>
+#include <log.h>
 #include <rng.h>
 
 DECLARE_GLOBAL_DATA_PTR;