ANDROID: vfs: d_canonical_path cleanup #if 0

Remove leftovers from previous rebase conflict.
This change doesn't affect the kernel functionality as it deletes
what already commented out but not removed by mistake.

Fixes: f37e0504 ("ANDROID: vfs: d_canonical_path for stacked FS")
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: Ic536b8ededb56833c17a5aacdd444d3a162a149d