phal: Added proc-pre-poweroff support

Changes:
-Adding new service which will be called during
chassis poweroff.

Test:
-Did poweroff to check, if the service file
is getting picked up or not and new added
procedure is getting called.

Signed-off-by: Chirag Sharma <chirshar@in.ibm.com>
Signed-off-by: Ramesh Iyyar <rameshi1@in.ibm.com>
Change-Id: Ic533433c4771216e5681b61cccf154f7ed029457
diff --git a/Makefile.am b/Makefile.am
index 895e28c..bdf512a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,7 +10,8 @@
 
 if ENABLE_PHAL
   systemdsystemunit_DATA += set-spi-mux.service \
-                            phal-reinit-devtree.service
+                            phal-reinit-devtree.service \
+                            proc-pre-poweroff@.service
 endif
 
 bin_PROGRAMS = \