refactor(st): move some storage definitions to common part

Those storage macros are common to all STM32MPU chips, move them to
plat/st/common/include/stm32mp_io_storage.h

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: Id20ec00ba65edf9ec7a3a89adfda307c954c3cb6
diff --git a/plat/st/stm32mp1/include/platform_def.h b/plat/st/stm32mp1/include/platform_def.h
index 61b847f..75c8219 100644
--- a/plat/st/stm32mp1/include/platform_def.h
+++ b/plat/st/stm32mp1/include/platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2023, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -25,10 +25,6 @@
 #define PLATFORM_STACK_SIZE		0xC00
 #endif
 
-#define FIP_IMAGE_NAME			"fip"
-#define METADATA_PART_1			"metadata1"
-#define METADATA_PART_2			"metadata2"
-
 #define STM32MP_PRIMARY_CPU		U(0x0)
 #define STM32MP_SECONDARY_CPU		U(0x1)