arm64: dts: ti: iot2050: Add layout of OSPI flash

Describe the layout of the OSPI flash as the latest firmware uses it.
Specifically the location of the U-Boot envs is important for userspace
in order to access it.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://lore.kernel.org/r/d135b246bd302060175276d3653f2891077eb109.1674110442.git.jan.kiszka@siemens.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi

@@ -609,6 +609,52 @@ flash@0 {
 		cdns,tchsh-ns = <60>;
 		cdns,tslch-ns = <60>;
 		cdns,read-delay = <2>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			seboot@0 {
+				label = "seboot";
+				reg = <0x0 0x180000>; /* 1.5M */
+			};
+
+			tispl@180000 {
+				label = "tispl";
+				reg = <0x180000 0x200000>; /* 2M */
+			};
+
+			u-boot@380000 {
+				label = "u-boot";
+				reg = <0x380000 0x300000>; /* 3M */
+			};
+
+			env@680000 {
+				label = "env";
+				reg = <0x680000 0x20000>; /* 128K */
+			};
+
+			env-backup@6a0000 {
+				label = "env.backup";
+				reg = <0x6a0000 0x20000>; /* 128K */
+			};
+
+			otpcmd@6c0000 {
+				label = "otpcmd";
+				reg = <0x6c0000 0x10000>; /* 64K */
+			};
+
+			unused@6d0000 {
+				label = "unused";
+				reg = <0x6d0000 0x7b0000>; /* 7872K */
+			};
+
+			seboot-backup@e80000 {
+				label = "seboot.backup";
+				reg = <0xe80000 0x180000>; /* 1.5M */
+			};
+		};
 	};
 };