fix(versal2): enable system reset

The commit 414cf08b76bc ("feat(versal2): add support for platform
management") changed how system reset works by requiring
pwrdwn_req_received to be set for TF-A to make a call to PLM firmware.

This accidentally blocked reset initiated by Linux or U-Boot,
as this flag is only set during PLM firmware initiated reset.

Fix this issue by enabling firmware call when pwrdwn_req_received
is not set, ensuring Linux and U-Boot can initiate reset properly.

Fixes: 414cf08b76bc ("feat(versal2): add support for platform management")
Change-Id: I6ffc9b2efa56a7bd843b296e2c892c064ffd054a
Signed-off-by: Naman Trivedi <naman.trivedimanojbhai@amd.com>
diff --git a/plat/amd/versal2/plat_psci_pm.c b/plat/amd/versal2/plat_psci_pm.c
index 50614d5..3cc6b95 100644
--- a/plat/amd/versal2/plat_psci_pm.c
+++ b/plat/amd/versal2/plat_psci_pm.c
@@ -110,7 +110,7 @@
 	 * Send the system reset request to the firmware if power down request
 	 * is not received from firmware.
 	 */
-	if (pwrdwn_req_received == true) {
+	if (pwrdwn_req_received == false) {
 		/*
 		 * TODO: shutdown scope for this reset needs be revised once
 		 * we have a clearer understanding of the overall reset scoping