Add c_str generic API and update makefiles

Change-Id: I954c95683b29ec61f1ebf33ef0e7c6de484a4d35
Original-Change-Id: I95e3b9013d3ab0c352d3614c12ee4ef0d26965d0
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/35924
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Brian R. Silver <bsilver@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36665
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/import/chips/p9/procedures/hwp/memory/lib/dimm/ddr4/state_machine.H

@@ -37,7 +37,7 @@
 #define _MSS_STATE_MACHINE_H_
 
 #include <fapi2.H>
-#include <lib/utils/c_str.H>
+#include <c_str.H>
 #include <lib/utils/checker.H>
 
 namespace mss