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: If171989d2c0c6a53d9368b776ac98dea743057da
diff --git a/softoff/Makefile.am b/softoff/Makefile.am
index 8383b68..00f78a5 100644
--- a/softoff/Makefile.am
+++ b/softoff/Makefile.am
@@ -1,5 +1,5 @@
 AM_DEFAULT_SOURCE_EXT = .cpp
-sbin_PROGRAMS = phosphor-softpoweroff
+bin_PROGRAMS = phosphor-softpoweroff
 
 # Using ../ instead of $(top_srcdir) due to automake bug in version 1.15.
 #  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=13928