labgrid/resource/remote: add missing sigrok channel_group parameter

Add the missing sigrok channel_group parameter to the Network variants
of the sigrok resources.

Fixes: d6c5973 ("driver/sigrokdriver: add channel-group parameter")
Signed-off-by: Sven Püschel <s.pueschel@pengutronix.de>

Author: pslldq

labgrid/resource/remote.py

@@ -186,6 +186,10 @@ class NetworkSigrokUSBDevice(RemoteUSBResource):
         default=None,
         validator=attr.validators.optional(attr.validators.instance_of(str))
     )
+    channel_group = attr.ib(
+        default=None,
+        validator=attr.validators.optional(attr.validators.instance_of(str))
+    )
     def __attrs_post_init__(self):
         self.timeout = 10.0
         super().__attrs_post_init__()
@@ -203,6 +207,10 @@ class NetworkSigrokUSBSerialDevice(RemoteUSBResource):
         default=None,
         validator=attr.validators.optional(attr.validators.instance_of(str))
     )
+    channel_group = attr.ib(
+        default=None,
+        validator=attr.validators.optional(attr.validators.instance_of(str))
+    )
     def __attrs_post_init__(self):
         self.timeout = 10.0
         super().__attrs_post_init__()