tbbr/dualroot: rename SP package certificate file

Currently only single signing domain is supported for SP packages but
there is plan to support dual signing domains if CoT is dualroot.

SP_CONTENT_CERT_ID is the certificate file which is currently generated
and signed with trusted world key which in-turn is derived from Silicon
provider RoT key.
To allow dual signing domain for SP packages, other certificate file
will be derived from Platform owned RoT key.

This patch renames "SP_CONTENT_CERT_ID" to "SIP_SP_CONTENT_CERT_ID" and
does other related changes.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I0bc445a3ab257e2dac03faa64f46e36a9fed5e93
diff --git a/include/drivers/auth/auth_mod.h b/include/drivers/auth/auth_mod.h
index 01d144d..504e539 100644
--- a/include/drivers/auth/auth_mod.h
+++ b/include/drivers/auth/auth_mod.h
@@ -51,11 +51,11 @@
 extern unsigned int auth_img_flags[MAX_NUMBER_IDS];
 
 #if defined(SPD_spmd)
-#define DEFINE_SP_PKG(n) \
+#define DEFINE_SIP_SP_PKG(n) \
 	static const auth_img_desc_t sp_pkg##n = { \
-		.img_id = SP_CONTENT_CERT_ID + (n), \
+		.img_id = SP_PKG##n##_ID, \
 		.img_type = IMG_RAW, \
-		.parent = &sp_content_cert, \
+		.parent = &sip_sp_content_cert, \
 		.img_auth_methods = (const auth_method_desc_t[AUTH_METHOD_NUM]) { \
 			[0] = { \
 				.type = AUTH_METHOD_HASH, \