board: stm32mp1: add support of nor1 device in dfu command

Add support of mtd backend for nor1 when this device is present on the
board, on STM32MP157C-EV1 for example, as the support of several MTD
spi-nor instance are now supported with commit b7f060565e ("mtd:
spi-nor: allow registering multiple MTDs when DM is enabled").

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

board/st/common/stm32mp_dfu.c

@@ -132,6 +132,10 @@ void set_dfu_alt_info(char *interface, char *devstr)
 			mtd = get_mtd_device_nm("nor0");
 			if (!IS_ERR_OR_NULL(mtd))
 				board_get_alt_info_mtd(mtd, buf);
+
+			mtd = get_mtd_device_nm("nor1");
+			if (!IS_ERR_OR_NULL(mtd))
+				board_get_alt_info_mtd(mtd, buf);
 		}
 
 		mtd = get_mtd_device_nm("nand0");