refactor(tc): change all occurrences of RSS to RSE

Changes all occurrences of "RSS" and "rss" in the code and build files
to "RSE" and "rse".

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: Idec0bf7a90ae381f5bc968e1bb167daace24a11f
diff --git a/plat/arm/board/tc/rse_ap_testsuites.c b/plat/arm/board/tc/rse_ap_testsuites.c
index aa47d4c..5f4dc16 100644
--- a/plat/arm/board/tc/rse_ap_testsuites.c
+++ b/plat/arm/board/tc/rse_ap_testsuites.c
@@ -11,7 +11,7 @@
  * necessary because both files define the function `extra_tests_init`, so a
  * linker error occurs when both are linked to BL31. This file defines a macro
  * that renames the colliding function names to something unique.
- * `plat/arm/board/tc/rss_ap_tests.c` can call the test init functions with
+ * `plat/arm/board/tc/rse_ap_tests.c` can call the test init functions with
  * their new name.
  */