kernel 6.9-rc1 fails to compile if debugfs is disabled

[A]

https://bugzilla.kernel.org/show_bug.cgi?id=218640

Bug 218640 - kernel 6.9-rc1 fails to compile if debugfs is disabled 

kernel 6.9-rc1 fails to compile if debugfs is disabled (CONFIG_DEBUG_FS):

it fails here:

```ERROR: modpost: "ras_get_debugfs_root" [drivers/ras/amd/fmpm.ko] undefined!
make[5]: *** [scripts/Makefile.modpost:145: Module.symvers] Error 1
make[4]: *** [Makefile:1871: modpost] Error 2
make[3]: *** [debian/rules:74: build-arch] Error 2
dpkg-buildpackage: error: make -f debian/rules binary subprocess returned exit status 2
make[2]: *** [scripts/Makefile.package:121: bindeb-pkg] Error 2
make[1]: *** [/ram/linux-6.9-rc1/Makefile:1541: bindeb-pkg] Error 2
make: *** [Makefile:240: __sub-make] Error 2```

if i enable debugfs, it compiles without failing.