boot: zephyr: flash_map: stm32: Use nor parent reg address

Avoids issues when multiple xspi nodes are enabled

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>

Author: erwango

boot/zephyr/flash_map_extended.c

@@ -24,8 +24,9 @@ BOOT_LOG_MODULE_DECLARE(mcuboot);
 /* MEMORY MAPPED for XiP on external NOR flash takes the sspi-nor or ospi-nor or qspi-nor device */
 #define FLASH_DEVICE_ID SPI_FLASH_0_ID
 #if DT_NODE_HAS_STATUS(DT_INST(0, st_stm32_xspi_nor), okay)
+#define DT_DRV_COMPAT st_stm32_xspi_nor
 #define FLASH_DEVICE_NODE DT_INST(0, st_stm32_xspi_nor)
-#define FLASH_DEVICE_BASE DT_REG_ADDR_BY_IDX(DT_INST(0, st_stm32_xspi),1)
+#define FLASH_DEVICE_BASE DT_REG_ADDR_BY_IDX(DT_INST_PARENT(0), 1)
 #elif DT_NODE_HAS_STATUS(DT_INST(0, st_stm32_ospi_nor), okay)
 #define FLASH_DEVICE_NODE DT_INST(0, st_stm32_ospi_nor)
 #define FLASH_DEVICE_BASE DT_REG_ADDR(DT_INST(0, st_stm32_ospi_nor))