build: install generated api enum and type headers

Otherwise, <api-name>.api_enum.h and <api-name>.api_types.h files are
unavailable. If plugin B needs to send an API message to plugin A,
it's out of luck.

Type: fix

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I25fdb904b5cf57727d6196fa2c0c71be68f207ed
Signed-off-by: Matthew Smith <mgsmith@netgate.com>
diff --git a/src/cmake/plugin.cmake b/src/cmake/plugin.cmake
index b18f337..a0c3de7 100644
--- a/src/cmake/plugin.cmake
+++ b/src/cmake/plugin.cmake
@@ -39,6 +39,8 @@
     set_property(GLOBAL APPEND PROPERTY VPP_API_FILES ${rpath}/${f})
     install(
       FILES ${CMAKE_CURRENT_BINARY_DIR}/${f}.h
+      ${CMAKE_CURRENT_BINARY_DIR}/${f}_enum.h
+      ${CMAKE_CURRENT_BINARY_DIR}/${f}_types.h
       DESTINATION include/vpp_plugins/${name}/${dir}
       COMPONENT ${PLUGIN_DEV_COMPONENT}
     )