fwk compat mat: add health@2.0

framework & storaged talks to health@2.0 HAL prior to healthd.

If the vendor service for health@2.0 is missing, framework / storaged
falls back and talks to healthd. Hence health@2.0 HAL is optional.

A follow-up change is needed to require launch devices to launch
with health@2.0 (i.e. current.xml says optional=false).

Bug: 62229583
Test: builds (assemble_vintf passes)

Change-Id: I49caca2b683e928f25e6f3cac2e2a8396b50f46a