Add meson build

This commit is to add meson build.
And later, we will remove Autotools and replace it with meson build.

In addition, fixed Layout::LedAction construct parameter error in test
file.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I58c9a2c9de928db288e77ca2d6aa807d36e70144
diff --git a/gen/xyz/meson.build b/gen/xyz/meson.build
new file mode 100644
index 0000000..e4991ad
--- /dev/null
+++ b/gen/xyz/meson.build
@@ -0,0 +1,2 @@
+# Generated file; do not modify.
+subdir('openbmc_project')