spm: Remove SPM Alpha 1 prototype and support files

The Secure Partition Manager (SPM) prototype implementation is
being removed. This is preparatory work for putting in place a
dispatcher component that, in turn, enables partition managers
at S-EL2 / S-EL1.

This patch removes:

- The core service files (std_svc/spm)
- The Resource Descriptor headers (include/services)
- SPRT protocol support and service definitions
- SPCI protocol support and service definitions

Change-Id: Iaade6f6422eaf9a71187b1e2a4dffd7fb8766426
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
Signed-off-by: Artsem Artsemenka <artsem.artsemenka@arm.com>
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 7ff054a..33d414d 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -5,16 +5,11 @@
 #
 
 ################################################################################
-# Include Makefile for either of the supported SPM implementations
+# Include Makefile for the SPM-MM implementation
 ################################################################################
-ifeq (${ENABLE_SPM},1)
-  $(info Including SPM (SPCI) makefile)
-  include services/std_svc/spm/spm.mk
-endif
-
 ifeq (${SPM_MM},1)
   ifeq (${EL3_EXCEPTION_HANDLING},0)
-    $(error EL3_EXCEPTION_HANDLING must be 1 for SPM support)
+    $(error EL3_EXCEPTION_HANDLING must be 1 for SPM-MM support)
   else
     $(info Including SPM Management Mode (MM) makefile)
     include services/std_svc/spm_mm/spm.mk