feat(st): add trace for early console

When the early console is configured with STM32MP_EARLY_CONSOLE,
display a message indicating it is enabled.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: Iafdfa5afef27eba823d707841853a8a46de0b42d
diff --git a/plat/st/common/stm32mp_common.c b/plat/st/common/stm32mp_common.c
index d922d3c..9a955a6 100644
--- a/plat/st/common/stm32mp_common.c
+++ b/plat/st/common/stm32mp_common.c
@@ -276,6 +276,7 @@
 {
 	plat_crash_console_init();
 	set_console(STM32MP_DEBUG_USART_BASE, STM32MP_DEBUG_USART_CLK_FRQ);
+	NOTICE("Early console setup\n");
 }
 #endif /* STM32MP_EARLY_CONSOLE */