Add support for RK3576 platform and restructure vendor packages directory

cross_compile/vendor/packages/eigen3_vendor/CMakeLists.txt

@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 3.8)
+project(eigen3_vendor)
+
+set(eigen3_vendor_MAJOR_VERSION 0)
+set(eigen3_vendor_MINOR_VERSION 0)
+set(eigen3_vendor_PATCH_VERSION 0)
+set(eigen3_vendor_VERSION
+  ${eigen3_vendor_MAJOR_VERSION}.${eigen3_vendor_MINOR_VERSION}.${eigen3_vendor_PATCH_VERSION})
+
+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(
+  eigen3
+  URL https://gitlab.com/libeigen/eigen/-/archive/3.4.0/eigen-3.4.0.tar.gz
+  # SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/ext/
+)
+
+set(CMAKE_BUILD_TYPE Release)
+set(BUILD_TESTING OFF)
+
+FetchContent_MakeAvailable(eigen3)
+

cross_compile/vendor/packages/eigen3_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>eigen3_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>