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: Id782714cdf6f8345330ba1cf241c615be8256bbf
diff --git a/power-supply/Makefile.am b/power-supply/Makefile.am
index 862db7c..98be703 100644
--- a/power-supply/Makefile.am
+++ b/power-supply/Makefile.am
@@ -1,7 +1,7 @@
 AM_DEFAULT_SOURCE_EXT = .cpp
 AM_CPPFLAGS = -iquote ${top_srcdir}
 
-sbin_PROGRAMS = \
+bin_PROGRAMS = \
 	witherspoon-psu-monitor
 
 witherspoon_psu_monitor_SOURCES = \