feat(fake_host): unify boot manifest setup in host platforms

Unify boot manifest and sysreg setup in host platforms.

Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
Change-Id: I3d273f5bb8cb88d95278b9039573d837e12f4d56
diff --git a/plat/host/common/include/host_utils.h b/plat/host/common/include/host_utils.h
index 645ea3b..8f69486 100644
--- a/plat/host/common/include/host_utils.h
+++ b/plat/host/common/include/host_utils.h
@@ -127,4 +127,15 @@
  */
 void host_util_set_cpuid(unsigned int cpuid);
 
+/*
+ * Return the address of the EL3 RMM shared buffer.
+ */
+unsigned char *host_util_get_el3_rmm_shared_buffer(void);
+
+/*
+ * Performs some initialization needed before RMM can be run, such as
+ * setting up callbacks for sysreg access.
+ */
+void host_util_setup_sysreg_and_boot_manifest(void);
+
 #endif /* HOST_UTILS_H */