stm32mp1: Add support for SPI-NAND boot device

STM32MP1 platform is able to boot from SPI-NAND devices.
These modifications add this support using the new
SPI-NAND framework.

Change-Id: I0d5448bdc4bde153c1209e8043846c0f935ae5ba
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index 7ac9b5f..a427dcf 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -340,6 +340,9 @@
 #define NAND_ECC_BIT_NB_8_BITS		U(3)
 #define NAND_ECC_ON_DIE			U(4)
 
+/* NAND number of planes */
+#define NAND_PLANE_BIT_NB_MASK		BIT(14)
+
 /*******************************************************************************
  * STM32MP1 TAMP
  ******************************************************************************/