firmware: psci: enable DM_FLAG_PRE_RELOC

It is possible that cpu core may reset before relocation with PSCI reset

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index ef3e983..c6b9efa 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -319,4 +319,5 @@
 #ifdef CONFIG_ARM_SMCCC_FEATURES
 	.plat_auto = sizeof(struct psci_plat_data),
 #endif
+	.flags = DM_FLAG_PRE_RELOC,
 };