Only allow skipping dex madvise on T+

Skipping the madvise call requires working knowledge of the process
state. However, pre T, the framework may delay certain process state
updates when the process is launching. As such, only allow the
short-circuit on T+.

Bug: 235390330
Test: m + validate madvise calls on T+
Change-Id: I515ac0dde116a99f7b82b71a4d6b468842943194