spm-mm: Refactor secure_partition.h and its contents

Before adding any new SPM-related components we should first do
some cleanup around the existing SPM-MM implementation. The aim
is to make sure that any SPM-MM components have names that clearly
indicate that they are MM-related. Otherwise, when adding new SPM
code, it could quickly become confusing as it would be unclear to
which component the code belongs.

The secure_partition.h header is a clear example of this, as the
name is generic so it could easily apply to any SPM-related code,
when it is in fact SPM-MM specific.

This patch renames the file and the two structures defined within
it, and then modifies any references in files that use the header.

Change-Id: I44bd95fab774c358178b3e81262a16da500fda26
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index eeae621..9efb2fd 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -22,7 +22,7 @@
 struct bl_load_info;
 struct bl_params;
 struct mmap_region;
-struct secure_partition_boot_info;
+struct spm_mm_boot_info;
 struct sp_res_desc;
 
 /*******************************************************************************
@@ -267,7 +267,7 @@
  * Secure Partitions functions
  ******************************************************************************/
 const struct mmap_region *plat_get_secure_partition_mmap(void *cookie);
-const struct secure_partition_boot_info *plat_get_secure_partition_boot_info(
+const struct spm_mm_boot_info *plat_get_secure_partition_boot_info(
 		void *cookie);
 int plat_spm_sp_rd_load(struct sp_res_desc *rd, const void *ptr, size_t size);
 int plat_spm_sp_get_next_address(void **sp_base, size_t *sp_size,