Enable clang-tidy (and fix warnings)

Test: keymaster_tests
Change-Id: Ia9455b0be7be71eca1b41a674f2dc7b9e9b00e8c
diff --git a/ng/AndroidSecureClock.cpp b/ng/AndroidSecureClock.cpp
index 8fdaee4..4c69621 100644
--- a/ng/AndroidSecureClock.cpp
+++ b/ng/AndroidSecureClock.cpp
@@ -27,10 +27,13 @@
 
 namespace aidl::android::hardware::security::secureclock {
 
-using namespace ::keymaster;
-using namespace ::aidl::android::hardware::security::keymint::km_utils;
+using keymaster::GenerateTimestampTokenRequest;
+using keymaster::GenerateTimestampTokenResponse;
+using keymint::km_utils::kmBlob2vector;
+using keymint::km_utils::kmError2ScopedAStatus;
 
-AndroidSecureClock::AndroidSecureClock(std::shared_ptr<keymint::AndroidKeyMintDevice> keymint)
+AndroidSecureClock::AndroidSecureClock(
+    const std::shared_ptr<keymint::AndroidKeyMintDevice>& keymint)
     : impl_(keymint->getKeymasterImpl()) {}
 
 AndroidSecureClock::~AndroidSecureClock() {}