run_config/fvp-spm.edk2: Add missing gen_fvp_yaml_template step

Because of this, the test didn't run in LAVA.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I65c8c86fa85e5cb0d480e7925e15f7a4100f03fe
diff --git a/run_config/fvp-spm.edk2 b/run_config/fvp-spm.edk2
index 8b3108a..f2a9e6c 100644
--- a/run_config/fvp-spm.edk2
+++ b/run_config/fvp-spm.edk2
@@ -20,4 +20,6 @@
 	# Expect scripts
 	uart="0" file="spm-edk2-uart0.exp" track_expect
 	uart="2" file="spm-edk2-uart2.exp" track_expect
+
+	payload_type="tftf" gen_fvp_yaml_template
 }