sandbox: dts: add Sandbox TPMv2.x node

This node declares the presence of the Sandbox TPMv2.x emulated chip,
available for testing.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 5a0f187..f2e5d65 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -422,6 +422,10 @@
 		clock-frequency = <1000000>;
 	};
 
+	tpm2 {
+		compatible = "sandbox,tpm2";
+	};
+
 	uart0: serial {
 		compatible = "sandbox,serial";
 		u-boot,dm-pre-reloc;