Finish the refactor work of bccPrepareExecutable

Rename bccPrepareExecutableEx to bccPrepareExecutable.
(These functions are the same, and we will remove
 bccPrepareExecutableEx several commits later.)

Change-Id: I519130bb3b731bf927cb92924f355d7d1ea0242c
diff --git a/driver/rsdBcc.cpp b/driver/rsdBcc.cpp
index 0c0aa10..86bec6e 100644
--- a/driver/rsdBcc.cpp
+++ b/driver/rsdBcc.cpp
@@ -112,7 +112,7 @@
         goto error;
     }
 
-    if (bccPrepareExecutableEx(drv->mBccScript, cacheDir, resName, 0) != 0) {
+    if (bccPrepareExecutable(drv->mBccScript, cacheDir, resName, 0) != 0) {
         LOGE("bcc: FAILS to prepare executable");
         goto error;
     }