Revert "ANDROID: fs: Restore vfs_path_lookup() export"

This reverts commit c1d30dd0 as sdcardfs
is no longer in the tree.

Bug: 157700134
Cc: Alistair Strachan <astrachan@google.com>
Cc: Yongqin Liu <yongqin.liu@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I88da5b222c6dcda0900da12ccb54122a723d3f6c