Clarify unsupported architecture error

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D5252

tools/ade

@@ -209,7 +209,7 @@ class Device:
             raise InvalidDeviceError("No image_version file found")
         a = self._exec('uname', '-m')
         if a not in TargetTriplet.SUPPORTED:
-            raise InvalidDeviceError("Unsupported architecture")
+            raise InvalidDeviceError("Unsupported architecture {}".format(a))
         self.version.arch = a