[Lite] Support custom Paddle-Lite lib setting

[DefTruth]

PR types(PR类型)

Description

• 支持指定自定义Paddle-Lite依赖库，通过PADDLELITE_DIRECTORY指定

• 用法示例：

cmake .. -DPADDLELITE_DIRECTORY=xxx/built/lite-android-arm64-v8a-fp16-latest-dev1

• lite-android-arm64-v8a-fp16-latest-dev1目录中包含：

 ls -lh */*
-rw-r--r--  1 root  staff    23K  1 17 01:22 include/paddle_api.h
-rw-r--r--  1 root  staff   8.3K  1 17 01:22 include/paddle_image_preprocess.h
-rw-r--r--  1 root  staff   1.6K  1 17 01:22 include/paddle_lite_factory_helper.h
-rw-r--r--  1 root  staff   7.5K  1 17 01:22 include/paddle_place.h
-rw-r--r--  1 root  staff    26K  1 17 01:22 include/paddle_use_kernels.h
-rw-r--r--  1 root  staff   7.9K  1 17 01:22 include/paddle_use_ops.h
-rw-r--r--  1 root  staff   4.8K  1 17 01:22 include/paddle_use_passes.h
-rw-r--r--  1 root  staff    92M  1 17 01:26 lib/libpaddle_api_full_bundled.a
-rwxr-xr-x  1 root  staff    14M  1 17 01:24 lib/libpaddle_full_api_shared.so