dts: arm: st: f7: add definition for backup SRAM

Add DT definition for the backup SRAM.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

dts/arm/st/f7/stm32f7.dtsi

@@ -679,6 +679,14 @@
 			status = "disabled";
 			label = "SDMMC_1";
 		};
+
+		backup_sram: memory@40024000 {
+			compatible = "st,stm32-backup-sram";
+			reg = <0x40024000 DT_SIZE_K(4)>;
+			clocks = <&rcc STM32_CLOCK_BUS_AHB1 0x00040000>;
+			label = "BACKUP_SRAM";
+			status = "disabled";
+		};
 	};
 
 	otghs_fs_phy: otghs_fs_phy {