refactor(psa): 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: I606e2663fb3719edf6372d6ffa4f1982eef45994
diff --git a/lib/psa/dice_protection_environment.c b/lib/psa/dice_protection_environment.c
index 44a5848..2145611 100644
--- a/lib/psa/dice_protection_environment.c
+++ b/lib/psa/dice_protection_environment.c
@@ -258,7 +258,7 @@
 		{ cmd_output, *cmd_output_size },
 	};
 
-	err = psa_call(RSS_DPE_SERVICE_HANDLE, 0,
+	err = psa_call(RSE_DPE_SERVICE_HANDLE, 0,
 			in_vec, IOVEC_LEN(in_vec), out_vec, IOVEC_LEN(out_vec));
 
 	if (err == PSA_SUCCESS) {