net: openthread: Move SRP Kconfig options to Kconfig.features

OPENTHREAD_SRP_CLIENT and OPENTHREAD_SRP_SERVER are Thread features and
not Thread configuration, so move them to Kconfig.features.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/subsys/net/l2/openthread/Kconfig.features b/subsys/net/l2/openthread/Kconfig.features
index 5502fb8..dbea4b1 100644
--- a/subsys/net/l2/openthread/Kconfig.features
+++ b/subsys/net/l2/openthread/Kconfig.features
@@ -185,3 +185,9 @@
 
 config OPENTHREAD_MLE_LINK_METRICS_ENABLE
 	bool "Enable Link Metrics support"
+
+config OPENTHREAD_SRP_CLIENT
+	bool "Enable SRP Client support"
+
+config OPENTHREAD_SRP_SERVER
+	bool "Enable SRP Server support"
diff --git a/subsys/net/l2/openthread/Kconfig.thread b/subsys/net/l2/openthread/Kconfig.thread
index 3a64a91..b5e2a58 100644
--- a/subsys/net/l2/openthread/Kconfig.thread
+++ b/subsys/net/l2/openthread/Kconfig.thread
@@ -89,9 +89,3 @@
 config OPENTHREAD_CSL_RECEIVE_TIME_AHEAD
 	int "CSL receiver wake up margin in units of 10 symbols"
 	default 3
-
-config OPENTHREAD_SRP_CLIENT
-	bool "Enable SRP Client support"
-
-config OPENTHREAD_SRP_SERVER
-	bool "Enable SRP Server support"