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/legacy_keymaster_device_wrapper.h b/keystore/legacy_keymaster_device_wrapper.h
index ad26221..cd2e5a7 100644
--- a/keystore/legacy_keymaster_device_wrapper.h
+++ b/keystore/legacy_keymaster_device_wrapper.h
@@ -43,7 +43,7 @@
 
 class LegacyKeymasterDeviceWrapper : public IKeymasterDevice {
   public:
-    LegacyKeymasterDeviceWrapper(keymaster2_device_t* dev);
+    explicit LegacyKeymasterDeviceWrapper(keymaster2_device_t* dev);
     virtual ~LegacyKeymasterDeviceWrapper();
 
     // Methods from ::android::hardware::keymaster::V3_0::IKeymasterDevice follow.