contexthub: Add VTS target tests

Introduce target-side VTS tests covering the Context Hub HAL.

Bug: 32021659
Test: make vts -j42 && \
      vts-tradefed run commandAndExit vts --primary-abi-only \
        --skip-all-system-status-check \
	--module ContexthubHidlTargetTest
Change-Id: I387ad0cccbfa824d292e2364f175dcec21134be1
diff --git a/contexthub/Android.bp b/contexthub/Android.bp
index ba90f2c..ed19a37 100644
--- a/contexthub/Android.bp
+++ b/contexthub/Android.bp
@@ -2,4 +2,5 @@
 subdirs = [
     "1.0",
     "1.0/default",
+    "1.0/vts/functional",
 ]