Rename SMC first argument

'fid' (short for 'function ID') makes for a more explicit name.

Change-Id: I41d90c39979162142b0377a68f4be90dc31de253
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
diff --git a/fwu/ns_bl2u/ns_bl2u_main.c b/fwu/ns_bl2u/ns_bl2u_main.c
index babcf93..5b1373f 100644
--- a/fwu/ns_bl2u/ns_bl2u_main.c
+++ b/fwu/ns_bl2u/ns_bl2u_main.c
@@ -52,7 +52,7 @@
 
 	/* Call FWU_SMC_UPDATE_DONE to indicate image update done. */
 	INFO("NS_BL2U: Calling FWU_SMC_UPDATE_DONE\n");
-	fwu_params.arg0 = FWU_SMC_UPDATE_DONE;
+	fwu_params.fid = FWU_SMC_UPDATE_DONE;
 	fwu_result = tftf_smc(&fwu_params);
 	ERROR("NS_BL2U: Unexpected return from FWU process (%d)\n",
 			(int)fwu_result.ret0);