hdmi_cec: Add HIDL definition and default implementation

Bug: 32073236
Test: make
Change-Id: I6f98bf0c523e31e2863a3c0379d7fda1ef51b0d6
diff --git a/tv/Android.bp b/tv/Android.bp
index 095839f..5ad82f4 100644
--- a/tv/Android.bp
+++ b/tv/Android.bp
@@ -1,4 +1,5 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
+    "cec/1.0",
     "input/1.0",
 ]