hidl2aidl: conversion of confirmationui hidl to aidl

Conversion of the confirmationui hidl interface to stable aidl interface.

Bug: b/205760172
Test: run vts -m VtsHalConfirmationUIV1_0Target
Change-Id: I1cd655b0abb319f0134e876955f298cb53fcf43c
diff --git a/confirmationui/OWNERS b/confirmationui/OWNERS
new file mode 100644
index 0000000..2bcdb0e
--- /dev/null
+++ b/confirmationui/OWNERS
@@ -0,0 +1,2 @@
+swillden@google.com
+subrahmanyaman@google.com