Upgrade LLVM_ROOT_PATH from external/llvm/llvm to external/llvm.

Change-Id: I254c0ae7499e7d601e648eb6886f6709eb28ee46
diff --git a/Android.mk b/Android.mk
index d227e12..9bc3b09 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,7 +1,7 @@
 ifneq ($(TARGET_SIMULATOR),true)
 
 LOCAL_PATH := $(call my-dir)
-LLVM_ROOT_PATH := external/llvm/llvm
+LLVM_ROOT_PATH := external/llvm
 
 USE_DISASSEMBLER := true