feat(stm32mp2): initialize gic and delay timer in bl31_plat_arch_setup

For minimal BL31 setup, GIC and tick must be initialized.

Change-Id: I8d62253e93b77cd8ce8091ccc9ea88208bdd6053
Signed-off-by: Maxime Méré <maxime.mere@foss.st.com>
diff --git a/plat/st/stm32mp2/bl31_plat_setup.c b/plat/st/stm32mp2/bl31_plat_setup.c
index eb3bcfc..586bfe8 100644
--- a/plat/st/stm32mp2/bl31_plat_setup.c
+++ b/plat/st/stm32mp2/bl31_plat_setup.c
@@ -122,6 +122,9 @@
 
 void bl31_plat_arch_setup(void)
 {
+	generic_delay_timer_init();
+
+	stm32mp_gic_init();
 }
 
 void bl31_platform_setup(void)