Enable dex madvise hints for low ram devices

Enable layout based madvise hints for low ram devices.

Reduces flash reads by 40% for AUPT use cases on low ram devices.

Test: build and flash
Bug: 63178181

(cherry picked from commit 63199d75a146cbcac1cbcac944cf054524ca8848)

Change-Id: Ica0abc10b8356fbd7ab38a71df91c2da74bf505b
1 file changed