Install phosphor-psu-monitor configuration files

Updates to install files from the configuration directory into the
datadir in the built image.

Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Change-Id: Idcf4713ce96cc7567bd0f004b82d5c2132f92cf8
diff --git a/phosphor-power-supply/meson.build b/phosphor-power-supply/meson.build
index 922a67e..342e4e4 100644
--- a/phosphor-power-supply/meson.build
+++ b/phosphor-power-supply/meson.build
@@ -1,3 +1,6 @@
+install_subdir('configurations',
+      strip_directory: true,
+      install_dir: get_option('datadir')/'phosphor-psu-monitor')
 
 phosphor_psu_monitor = executable(
     'phosphor-psu-monitor',