refactor(stm32mp1): add helpers for IO compensation cells

Add enable_io_comp_cell and disable_io_comp_cell local helpers
to enable or disable an IO compensation cell.

Change-Id: I65295298a7ece572ae939e2db93d10b188de0f9e
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/plat/st/stm32mp1/bl2_plat_setup.c b/plat/st/stm32mp1/bl2_plat_setup.c
index 3c6f48a..0c93f27 100644
--- a/plat/st/stm32mp1/bl2_plat_setup.c
+++ b/plat/st/stm32mp1/bl2_plat_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -308,6 +308,8 @@
 
 	print_reset_reason();
 
+	stm32mp1_syscfg_enable_io_compensation_finish();
+
 #if !STM32MP_USE_STM32IMAGE
 	fconf_populate("TB_FW", STM32MP_DTB_BASE);
 #endif /* !STM32MP_USE_STM32IMAGE */