Added back old rsClearObject()

Bug: 28121289

To keep vendor drivers running without rebuild.

This is simply a wrapper of the new rsClearObject() function without
the first Context parameter.

Change-Id: Ie84ca515274da609b7a0eb46fef9019dd691305c

rsScriptC_Lib.cpp

diff --git a/rsScriptC_Lib.cpp b/rsScriptC_Lib.cpp
index e38c7e8..b460031 100644
--- a/rsScriptC_Lib.cpp
+++ b/rsScriptC_Lib.cpp
@@ -166,6 +166,11 @@
 }
 
 // Legacy, remove when drivers are updated
+void rsrClearObject(const Context *rsc, rs_object_base *dst) {
+    rsrClearObject(dst);
+}
+
+// Legacy, remove when drivers are updated
 void rsrSetObject(const Context *rsc, void *dst, ObjectBase *src) {
     if (src == nullptr) {
         rsrClearObject(rsc, dst);