refactor(st-pmic): split initialize_pmic()

print_pmic_info_and_debug() prints the PMIC version ID and displays
regulator information if debug is enabled.
It is under DEBUG flag and called after initialize_pmic() in BL2.

Change-Id: Ib81a625740b7ec6abb49cfca05e44c69efaa4718
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
diff --git a/include/drivers/st/stm32mp_pmic.h b/include/drivers/st/stm32mp_pmic.h
index 984cd60..4872734 100644
--- a/include/drivers/st/stm32mp_pmic.h
+++ b/include/drivers/st/stm32mp_pmic.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2019, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2017-2021, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -41,6 +41,14 @@
  */
 void initialize_pmic(void);
 
+#if DEBUG
+void print_pmic_info_and_debug(void);
+#else
+static inline void print_pmic_info_and_debug(void)
+{
+}
+#endif
+
 /*
  * pmic_ddr_power_init - Initialize regulators required for DDR
  *