mm: fix anon vma naming

Fix two bugs caused by merging anon vma_naming, a typo in
mempolicy.c and a bad merge in sys.c.

Change-Id: Ia4ced447d50573e68195e95ea2f2b4d9456b8a90
Signed-off-by: Colin Cross <ccross@android.com>
Git-commit: 527aae529118f2cbe99c945ffe74be1c04ceaba6
Git-Repo: https://android.googlesource.com/kernel/common.git


Signed-off-by: Ian Maund <imaund@codeaurora.org>