Change install dir to sbin

OpenBMC userspace applications are usually installed
into /usr/sbin/, not /usr/bin.

Tested: Build in bitbake

Change-Id: I37f645ac7e11cef9b1616d1d712ba1d22b9e1214
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 926f5ba..817857e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,4 +54,4 @@
 add_executable(${PROJECT_NAME} ${SRC_FILES} )
 target_link_libraries(${PROJECT_NAME} "${SDBUSPLUSPLUS_LIBRARIES} -lphosphor_dbus  -lstdc++fs")
 
-install (TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
+install (TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_SBINDIR})