Add support for RK3576 platform and restructure vendor packages directory

cross_compile/vendor/packages/mimick_vendor/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.8)
+project(mimick_vendor)
+
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+
+# uncomment the following section in order to fill in
+# further dependencies manually.
+# find_package(<dependency> REQUIRED)
+
+include(FetchContent)
+FetchContent_Declare(
+  mimick_vendor
+  GIT_REPOSITORY https://github.com/ros2/Mimick.git
+  GIT_TAG 1e138b0e13da99278453dc96af954890d9f48348
+)
+
+FetchContent_MakeAvailable(mimick_vendor)
+

cross_compile/vendor/packages/mimick_vendor/package.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<package format="3">
+  <name>mimick_vendor</name>
+  <version>0.0.0</version>
+  <description>TODO: Package description</description>
+  <maintainer email="ericzhao0325@163.com">ericx</maintainer>
+  <license>TODO: License declaration</license>
+
+  <export>
+    <build_type>cmake</build_type>
+  </export>
+</package>