Update HVAC targetSdk to 31

Bug: 215654235
Test: Manually made sure hvac apk compiled.
Change-Id: Ib05eb81493d0f562f8c6684560f428fd61f68e45
1 file changed
tree: 892b34dc4b0830c5cfc7e3e4cfe65865bcbb0494
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. OWNERS