Fix/suppress system/security google-explicit-constructor warnings

* Add explicit to conversion constructors/operators
* Use NOLINT or NOLINTNEXTLINE to suppress warnings on intended converters

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: I4ed5aea36fcdcd8dbda9a4be9607c5af606f2a08
diff --git a/keystore/keystore_attestation_id.h b/keystore/keystore_attestation_id.h
index f45d5be..63015ee 100644
--- a/keystore/keystore_attestation_id.h
+++ b/keystore/keystore_attestation_id.h
@@ -33,12 +33,18 @@
 
 template <typename T> class StatusOr {
   public:
+    // NOLINTNEXTLINE(google-explicit-constructor)
     StatusOr(const status_t error) : _status(error), _value() {}
+    // NOLINTNEXTLINE(google-explicit-constructor)
     StatusOr(const T& value) : _status(NO_ERROR), _value(value) {}
+    // NOLINTNEXTLINE(google-explicit-constructor)
     StatusOr(T&& value) : _status(NO_ERROR), _value(value) {}
 
+    // NOLINTNEXTLINE(google-explicit-constructor)
     operator const T&() const { return _value; }
+    // NOLINTNEXTLINE(google-explicit-constructor)
     operator T&() { return _value; }
+    // NOLINTNEXTLINE(google-explicit-constructor)
     operator T &&() && { return std::move(_value); }
 
     bool isOk() const { return NO_ERROR == _status; }