Update RenderScript build rules for rebase to LLVM r256229

http://b/26987366

- Use clang-2690385 to build RenderScript toolchain.
- Use armv7-linux-androideabi as the triple used to build RenderScript
  runtime libraries.

Change-Id: I582e8b25bbc38b101a2e765028ed61edbce7bdc2
diff --git a/core/clang/TARGET_x86.mk b/core/clang/TARGET_x86.mk
index 9ca86a1..741768b 100644
--- a/core/clang/TARGET_x86.mk
+++ b/core/clang/TARGET_x86.mk
@@ -66,7 +66,7 @@
   $(call $(clang_2nd_arch_prefix)convert-to-clang-flags,$($(clang_2nd_arch_prefix)TARGET_GLOBAL_LDFLAGS)) \
   $(CLANG_CONFIG_x86_TARGET_EXTRA_LDFLAGS)
 
-$(clang_2nd_arch_prefix)RS_TRIPLE := armv7-none-linux-gnueabi
+$(clang_2nd_arch_prefix)RS_TRIPLE := armv7-linux-androideabi
 $(clang_2nd_arch_prefix)RS_TRIPLE_CFLAGS := -D__i386__
 $(clang_2nd_arch_prefix)RS_COMPAT_TRIPLE := i686-linux-android