Fix/suppress libs/gui google-explicit-constructor warnings

* Add explicit to conversion constructors/operators

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: I76384db26fac6da2de3dbb9092c26c4979324948
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 6e196bf..959aafc 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -635,8 +635,7 @@
 
 class FakeProducerFrameEventHistory : public ProducerFrameEventHistory {
 public:
-    FakeProducerFrameEventHistory(FenceToFenceTimeMap* fenceMap)
-        : mFenceMap(fenceMap) {}
+    explicit FakeProducerFrameEventHistory(FenceToFenceTimeMap* fenceMap) : mFenceMap(fenceMap) {}
 
     ~FakeProducerFrameEventHistory() {}