Update for ::descriptor -> const char *.

Test: hidl_test/hidl_test_java
Bug: 32745840
Change-Id: Ibcd60fa35953700a880b5d9d53781925e068d64e
diff --git a/HidlSupport.cpp b/HidlSupport.cpp
index e684e26..18beb3d 100644
--- a/HidlSupport.cpp
+++ b/HidlSupport.cpp
@@ -169,8 +169,7 @@
 // static
 const size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer);
 
-const ::android::String16 IBase::descriptor(
-        "android.hardware.base@0.0::IBase");
+const char* IBase::descriptor = "android.hardware.base@0.0::IBase";
 
 // ----------------------------------------------------------------------
 // HidlInstrumentor implementation.