defconfig: msm: Disable VM reclaim on sdxpoorwills

Disable VM reclaim feature on sdxpoorwills since it
doesn't have exhausted virtual memory space issue.

Change-Id: I1e8fcbf4aa855c366ffa78c8d3029e3193abcb6b
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>