Use a different linker for ASan binaries.

Another change in bionic/linker adds linker_asan/linker_asan64 that
know where to find ASan shared libraries.
Also, include linker_asan to the required packages list when building
for ASan.

Change-Id: I8ebe7c0091bbeb0c135708a891d33d9844373d37
diff --git a/core/clang/TARGET_arm.mk b/core/clang/TARGET_arm.mk
index cd25604..5ac5477 100644
--- a/core/clang/TARGET_arm.mk
+++ b/core/clang/TARGET_arm.mk
@@ -70,3 +70,4 @@
 # Address sanitizer clang config
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan-arm-android
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_RPATH := /data/vendor/lib:/$(TARGET_COPY_OUT_VENDOR)/lib:/data/lib
+$(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan