Add LED hooks to hsbp manager

This adds the led group interface so that they can
be activiated by NVMe daemon.

Tested: Set using dbus, went and saw drive flashing

Change-Id: I2e1aa3f9338609370d9758a7c4874428dac5d4ea
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/hsbp-manager/include/utils.hpp b/hsbp-manager/include/utils.hpp
index 8e63bfe..986c3b2 100644
--- a/hsbp-manager/include/utils.hpp
+++ b/hsbp-manager/include/utils.hpp
@@ -45,6 +45,12 @@
 constexpr const char* interface = "xyz.openbmc_project.Inventory.Item";
 } // namespace inventory
 
+namespace ledGroup
+{
+constexpr const char* interface = "xyz.openbmc_project.Led.Group";
+constexpr const char* asserted = "Asserted";
+} // namespace ledGroup
+
 namespace hsbp
 {
 enum class registers : uint8_t