Add Hoth interface

Create a new google namespace and add the Hoth interface to this
namespace.

Signed-off-by: John Edward Broadbent <jebr@google.com>
Change-Id: I001dc34ef081885b6094d3d1aab578b0d882b53a
diff --git a/gen/com/google/meson.build b/gen/com/google/meson.build
new file mode 100644
index 0000000..194bca6
--- /dev/null
+++ b/gen/com/google/meson.build
@@ -0,0 +1,2 @@
+# Generated file; do not modify.
+subdir('gbmc')