ANDROID: incfs: update renamedata to dentrys

The rd->old_dir and rd->new_dir members of struct renamedata were
updated from inode to dentry type in commit bc924136 ("VFS: change
old_dir and new_dir in struct renamedata to dentrys"). Make the
corresponding updates to incfs.

Cc: Paul Lawrence <paullawrence@google.com>
Fixes: bc924136 ("VFS: change old_dir and new_dir in struct renamedata to dentrys")
Change-Id: Ibecaa70bd742a5a36bd61b3651f7b6f036407261
Signed-off-by: Carlos Llamas <cmllamas@google.com>