chore(docs): drop the "wfi" from `pwr_domain_pwr_down_wfi`

To allow for generic handling of a wakeup, this hook is no longer
expected to call wfi itself. Update the name everywhere to reflect this
expectation so that future platform implementers don't get misled.

Change-Id: Ic33f0b6da74592ad6778fd802c2f0b85223af614
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/plat/st/stm32mp2/stm32mp2_pm.c b/plat/st/stm32mp2/stm32mp2_pm.c
index 5bb381d..9be42c5 100644
--- a/plat/st/stm32mp2/stm32mp2_pm.c
+++ b/plat/st/stm32mp2/stm32mp2_pm.c
@@ -103,7 +103,7 @@
 	.pwr_domain_suspend = stm32_pwr_domain_suspend,
 	.pwr_domain_on_finish = stm32_pwr_domain_on_finish,
 	.pwr_domain_suspend_finish = stm32_pwr_domain_suspend_finish,
-	.pwr_domain_pwr_down_wfi = stm32_pwr_domain_pwr_down_wfi,
+	.pwr_domain_pwr_down = stm32_pwr_domain_pwr_down_wfi,
 	.system_off = stm32_system_off,
 	.system_reset = stm32_system_reset,
 	.validate_power_state = stm32_validate_power_state,