Change scope of auto-generated build info header

This file is only needed when built in openpower-hw-diags for openbmc.
It is not needed when built in Hostboot or other user applications. The
header and supporting functions were pulled out of the rest of the
libhei source so that it can build in Hostboot or other user
applications.

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: Ica5e6e6141acfe1866459a43df448b5c6ee3d29e
diff --git a/meson.build b/meson.build
index 020bf73..426467e 100644
--- a/meson.build
+++ b/meson.build
@@ -41,6 +41,7 @@
                                 install: true)
 
 install_headers(
+    'src/hei_buildinfo.hpp',
     'src/hei_chip.hpp',
     'src/hei_isolation_data.hpp',
     'src/hei_main.hpp',