configs: stm32mp1: replace STM32MP1_TRUSTED by TFABOOT

Activate ARCH_SUPPORT_TFABOOT and replace the arch stm32mp
specific config CONFIG_STM32MP1_TRUSTED by the generic CONFIG_TFABOOT
introduced by the commit 535d76a12150 ("armv8: layerscape: Add TFABOOT
support").
This config CONFIG_TFABOOT is activated for the trusted boot chain,
when U-Boot is loaded by TF-A.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 07f5344..6c88402 100644
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -92,7 +92,7 @@
 
 	if (IS_ENABLED(CONFIG_STM32MP1_OPTEE))
 		mode = "trusted with OP-TEE";
-	else if (IS_ENABLED(CONFIG_STM32MP1_TRUSTED))
+	else if (IS_ENABLED(TFABOOT))
 		mode = "trusted";
 	else
 		mode = "basic";
@@ -462,7 +462,7 @@
 
 static void sysconf_init(void)
 {
-#ifndef CONFIG_STM32MP1_TRUSTED
+#ifndef CONFIG_TFABOOT
 	u8 *syscfg;
 #ifdef CONFIG_DM_REGULATOR
 	struct udevice *pwr_dev;