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: I1b764bb63d7a79b69a94f63e2c449b5e1ca5ffb8
diff --git a/gpio-util/Makefile.am b/gpio-util/Makefile.am
index 241cb19..d596362 100644
--- a/gpio-util/Makefile.am
+++ b/gpio-util/Makefile.am
@@ -1,7 +1,7 @@
 AM_DEFAULT_SOURCE_EXT = .cpp
 AM_CPPFLAGS = -iquote ${top_srcdir}
 
-sbin_PROGRAMS = \
+bin_PROGRAMS = \
 	phosphor-gpio-util
 
 phosphor_gpio_util_SOURCES = \