change how the userspace GLES drivers are named

for single library:
  /vendor/lib/egl/GLES.so

for multiple libraries:
  /vendor/lib/egl/EGL.so
  /vendor/lib/egl/GLESv1_CM.so
  /vendor/lib/egl/GLESv2.so

EGL_BOARD_CONFIG as well as egl.cfg are not needed anymore.

To facilitate the transition, the loader will also look
for the older naming scheme.

Bug: 8631636
Change-Id: Id4b113468df29bae72b323f76598229914e1c7a1
diff --git a/opengl/libs/EGL/Loader.h b/opengl/libs/EGL/Loader.h
index 30773cb..8cefe32 100644
--- a/opengl/libs/EGL/Loader.h
+++ b/opengl/libs/EGL/Loader.h
@@ -52,7 +52,6 @@
         void* dso[3];
     };
     
-    String8 mDriverTag;
     getProcAddressType getProcAddress;
     
 public:
@@ -63,7 +62,7 @@
     
 private:
     Loader();
-    void *load_driver(const char* kind, const char *tag, egl_connection_t* cnx, uint32_t mask);
+    void *load_driver(const char* kind, egl_connection_t* cnx, uint32_t mask);
 
     static __attribute__((noinline))
     void init_api(void* dso,