stm32mp1: use TZC400 macro to describe filters

On STM32MP15, only filters 0 and 1 are used.
Use TZC_400_REGION_ATTR_FILTER_BIT() macro for those 2 filters 0 and 1
instead of U(3).

Change-Id: Ibc61823842ade680f59d5b66b8db59b6a30080e4
Signed-off-by: Yann Gautier <yann.gautier@st.com>

plat/st/stm32mp1/stm32mp1_def.h

 /*
- * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -381,7 +381,8 @@ enum ddr_type {
 #define STM32MP1_TZC_ETH_ID		U(10)
 #define STM32MP1_TZC_DAP_ID		U(15)
 
-#define STM32MP1_FILTER_BIT_ALL		U(3)
+#define STM32MP1_FILTER_BIT_ALL		(TZC_400_REGION_ATTR_FILTER_BIT(0) | \
+					 TZC_400_REGION_ATTR_FILTER_BIT(1))
 
 /*******************************************************************************
  * STM32MP1 SDMMC