build: install into bin instead of sbin

Installs into bin instead of sbin per guidelines.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I8781724e7261745896166421504ba88f37690ebc
diff --git a/Makefile.am b/Makefile.am
index d6720ab..f95a44d 100755
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,7 +2,7 @@
 
 ACLOCAL_AMFLAGS = -Im4
 
-sbin_PROGRAMS = \
+bin_PROGRAMS = \
 	openpower-update-manager \
 	openpower-pnor-msl