Replace vector usage in collect_vma with map am: 92fcf5f1ca

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/2196974

Change-Id: I8b73653ba1604256e094fe473fab44fe6b02b7a3
Signed-off-by: Automerger Merge Worker <[email protected]>