sandbox64: add support for NVMXIP QSPI

enable NVMXIP QSPI for sandbox 64-bit

Adding two NVM XIP QSPI storage devices.

Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 7c1ee71..bcdea0b 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -1802,6 +1802,20 @@
 		compatible = "u-boot,fwu-mdata-gpt";
 		fwu-mdata-store = <&mmc0>;
 	};
+
+	nvmxip-qspi1@08000000 {
+		compatible = "nvmxip,qspi";
+		reg = <0x08000000 0x00200000>;
+		lba_shift = <9>;
+		lba = <4096>;
+	};
+
+	nvmxip-qspi2@08200000 {
+		compatible = "nvmxip,qspi";
+		reg = <0x08200000 0x00100000>;
+		lba_shift = <9>;
+		lba = <2048>;
+	};
 };
 
 #include "sandbox_pmic.dtsi"