build: install into bin instead of sbin

Installs into bin instead of sbin per guidelines.

Change-Id: I298c17fb2bf6fcb6a949624f8bb2475f3878545f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index b4577f2..98b73bd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -32,7 +32,7 @@
 @CODE_COVERAGE_RULES@
 endif
 
-sbin_PROGRAMS = phosphor-hwmon-readd
+bin_PROGRAMS = phosphor-hwmon-readd
 
 phosphor_hwmon_readd_SOURCES = readd.cpp
 phosphor_hwmon_readd_LDADD = $(SDBUSPLUS_LIBS) $(CODE_COVERAGE_LIBS) libhwmon.la