feat(stm32mp1): register fixed regulator

Register fixed regulator in BL2.

Change-Id: I24292f549b2cd24fb717fbb68eb95af7aa68e3b9
Signed-off-by: Pascal Paillet <p.paillet@st.com>
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index ee1644c..b43245f 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -465,6 +465,8 @@
  ******************************************************************************/
 /* 3 PWR + 1 VREFBUF + 14 PMIC regulators + 1 FIXED */
 #define PLAT_NB_RDEVS			U(19)
+/* 1 FIXED */
+#define PLAT_NB_FIXED_REGS		U(1)
 
 /*******************************************************************************
  * Device Tree defines