Vts16KPageSizeTest: require 16kB align, not 64kB

Reduce requirement because it turns out that 64kB
has a larger impact on the page table size and page
caching than anticipated, exacerbated by use of
`-z separate-loadable-segments` instead of
`-z separate-code` which caused many small segments to
increase in size in Android.

Bug: 328797737
Test: Vts16KPageSizeTest
Change-Id: I6451ab8da40e5c08a661c56e5bf9d28d9f4e61d3
1 file changed