trusty: Export ConfirmationUI helper classes

And fix namespaces.

Bug: 174402999
Test: m
Change-Id: I54dcc92d8c153d0fa2b10b2679a9a871699de8b1
diff --git a/trusty/confirmationui/TrustyConfirmationUI.cpp b/trusty/confirmationui/TrustyConfirmationUI.cpp
index c8b24e3..c6625e0 100644
--- a/trusty/confirmationui/TrustyConfirmationUI.cpp
+++ b/trusty/confirmationui/TrustyConfirmationUI.cpp
@@ -50,7 +50,7 @@
 
 using namespace secure_input;
 
-using ::android::trusty::TrustyAppError;
+using ::android::trusty::confirmationui::TrustyAppError;
 
 using ::teeui::AbortMsg;
 using ::teeui::DeliverTestCommandMessage;