Fix module dependency resolution for clean builds

- Use container modules from kernel_modules stage for dependency resolution
- Remove dependency on initramfs modules that haven't been copied yet
- Fixes regression where clean builds had empty stage1.list
- Dependency resolution now works correctly in clean build scenarios

initramfs/etc/passwd

@@ -1,4 +1,4 @@
-root:x:0:0:root:/root:/bin/sh
+root::0:0:root:/root:/bin/sh
 bin:x:1:1:bin:/bin:/sbin/nologin
 daemon:x:2:2:daemon:/sbin:/sbin/nologin
 lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin