Include private/fs_config.h directly when needed

This is no longer a transitive include of android_filesystem_config.h

Bug: 149785767
Test: build
Change-Id: Ib546dbc3b6f546ba48009cc9d6d0f4564acf0872

tools/fs_config/fs_config.c

@@ -26,6 +26,7 @@
 #include <selinux/label.h>
 
 #include "private/android_filesystem_config.h"
+#include "private/fs_config.h"
 
 // This program takes a list of files and directories (indicated by a
 // trailing slash) on the stdin, and prints to stdout each input

tools/fs_get_stats/fs_get_stats.c

@@ -4,6 +4,7 @@
 #include <unistd.h>
 
 #include <private/android_filesystem_config.h>
+#include <private/fs_config.h>
 
 #define DO_DEBUG 1