ARM: dts: armada-385-turris-omnia: add `u-boot-env` NOR partition

Specify a separate partition `u-boot-env` for U-Boot's env settings for
the Turris Omnia board.

Do this only in U-Boot's specific DTS. We do not want to do this in
Linux' official DTS, because Omnia's stock U-Boot stores env at a
different address, and there are still boards with stock U-Boot.

In a subsequent patch will add board code that fixes Linux's DTB before
booting Linux.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Reviewed-by: NStefan Roese <sr@denx.de>

arch/arm/dts/armada-385-turris-omnia-u-boot.dtsi

@@ -43,6 +43,17 @@
 
 	spi-nor@0 {
 		u-boot,dm-pre-reloc;
+
+		partitions {
+			partition@0 {
+				reg = <0x0 CONFIG_ENV_OFFSET>;
+			};
+
+			partition@f0000 {
+				reg = <CONFIG_ENV_OFFSET CONFIG_ENV_SIZE>;
+				label = "u-boot-env";
+			};
+		};
 	};
 };