[Android] Fix header after recent tvm runtime refactor (#3185)

This PR fixes `tvm_runtime.h` for android, which removes the
include of a removed file, and inserts the include of a new
source file.  This fixes the broken android app build flow.

Author: MasterJH5574

android/mlc4j/src/cpp/tvm_runtime.h

@@ -20,9 +20,9 @@
 #include <runtime/opencl/opencl_device_api.cc>
 #include <runtime/opencl/opencl_module.cc>
 #include <runtime/opencl/opencl_wrapper/opencl_wrapper.cc>
-#include <runtime/opencl/texture_pool.cc>
 #include <runtime/profiling.cc>
 #include <runtime/registry.cc>
+#include <runtime/relax_vm/attn_backend.cc>
 #include <runtime/relax_vm/builtin.cc>
 #include <runtime/relax_vm/bytecode.cc>
 #include <runtime/relax_vm/executable.cc>