Split platform.h into separate headers

Previously, platform.h contained many declarations and definitions
used for different purposes. This file has been split so that:

* Platform definitions used by common code that must be defined
  by the platform are now in platform_def.h. The exact include
  path is exported through $PLAT_INCLUDES in the platform makefile.

* Platform definitions specific to the FVP platform are now in
  /plat/fvp/fvp_def.h.

* Platform API declarations specific to the FVP platform are now
  in /plat/fvp/fvp_private.h.

* The remaining platform API declarations that must be ported by
  each platform are still in platform.h but this file has been
  moved to /include/plat/common since this can be shared by all
  platforms.

Change-Id: Ieb3bb22fbab3ee8027413c6b39a783534aee474a
diff --git a/services/spd/tspd/tspd_common.c b/services/spd/tspd/tspd_common.c
index 2ca6a56..6b3592e 100644
--- a/services/spd/tspd/tspd_common.c
+++ b/services/spd/tspd/tspd_common.c
@@ -32,7 +32,6 @@
 #include <assert.h>
 #include <bl_common.h>
 #include <context_mgmt.h>
-#include <platform.h>
 #include <string.h>
 #include "tspd_private.h"
 
diff --git a/services/spd/tspd/tspd_pm.c b/services/spd/tspd/tspd_pm.c
index 2f20449..ec4989d 100644
--- a/services/spd/tspd/tspd_pm.c
+++ b/services/spd/tspd/tspd_pm.c
@@ -33,6 +33,7 @@
 #include <bl_common.h>
 #include <context_mgmt.h>
 #include <debug.h>
+#include <platform.h>
 #include <tsp.h>
 #include "tspd_private.h"
 
diff --git a/services/spd/tspd/tspd_private.h b/services/spd/tspd/tspd_private.h
index fb71922..5d7bf4b 100644
--- a/services/spd/tspd/tspd_private.h
+++ b/services/spd/tspd/tspd_private.h
@@ -34,7 +34,7 @@
 #include <arch.h>
 #include <context.h>
 #include <interrupt_mgmt.h>
-#include <platform.h>
+#include <platform_def.h>
 #include <psci.h>
 
 /*******************************************************************************
diff --git a/services/std_svc/psci/psci_afflvl_on.c b/services/std_svc/psci/psci_afflvl_on.c
index 360b286..1e5828c 100644
--- a/services/std_svc/psci/psci_afflvl_on.c
+++ b/services/std_svc/psci/psci_afflvl_on.c
@@ -34,6 +34,7 @@
 #include <bl_common.h>
 #include <bl31.h>
 #include <context_mgmt.h>
+#include <platform.h>
 #include <runtime_svc.h>
 #include <stddef.h>
 #include "psci_private.h"
diff --git a/services/std_svc/psci/psci_common.c b/services/std_svc/psci/psci_common.c
index c61e87a..b1ee10d 100644
--- a/services/std_svc/psci/psci_common.c
+++ b/services/std_svc/psci/psci_common.c
@@ -35,6 +35,7 @@
 #include <context.h>
 #include <context_mgmt.h>
 #include <debug.h>
+#include <platform.h>
 #include "psci_private.h"
 
 /*