Depend on KeyMint HAL via default

This allows for easier bumping of the KeyMint version level.

At the moment this change should have no effect: the same dependency
is used, just reached via a default rather than explicitly.

However, when the KeyMint version increases in the near future, using
this default should mean that no change is needed here: the default
definition will change to -V2 and this will be referenced here.

Test: TreeHugger
Change-Id: Ibf71e98ccfafda2971ee7d551f8b4c8b35defcec
1 file changed