Simplify OpenGL TLS access on ARM.

bionic now assumes the TLS register is available, so OpenGL can too.

Change-Id: If2b56a4c08de9f887759b78f70022026a181dc47
diff --git a/opengl/libs/GLES2/gl2.cpp b/opengl/libs/GLES2/gl2.cpp
index 55ef499..fca42ec 100644
--- a/opengl/libs/GLES2/gl2.cpp
+++ b/opengl/libs/GLES2/gl2.cpp
@@ -41,14 +41,7 @@
 
 #if USE_FAST_TLS_KEY
 
-    #ifdef HAVE_ARM_TLS_REGISTER
-        #define GET_TLS(reg) \
-            "mrc p15, 0, " #reg ", c13, c0, 3 \n"
-    #else
-        #define GET_TLS(reg) \
-            "mov   " #reg ", #0xFFFF0FFF      \n"  \
-            "ldr   " #reg ", [" #reg ", #-15] \n"
-    #endif
+    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
 
     #define API_ENTRY(_api) __attribute__((naked)) _api