[nrf noup] samples: mgmt: mcumgr smp_svr: Migrate child image config

Migrates child image configuration for this sample over to sysbuild

Signed-off-by: Jamie McCrae <[email protected]>
(cherry picked from commit cb74dbe)

Author: nordicjm

samples/subsys/mgmt/mcumgr/smp_svr/sysbuild/hci_rpmsg.conf

@@ -0,0 +1,10 @@
+#
+# Copyright (c) 2022 Nordic Semiconductor
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_BT_MAX_CONN=2
+CONFIG_BT_BUF_ACL_RX_SIZE=502
+CONFIG_BT_BUF_ACL_TX_SIZE=502
+CONFIG_BT_CTLR_DATA_LENGTH_MAX=251