ccimx93: bluetooth-init: leave the interface up after attaching

Ensure we leave the Bluetooth interface up after attaching it. If not,
under some circumstances, it could be down.

https://onedigi.atlassian.net/browse/DEL-8608

Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>

meta-digi-dey/recipes-connectivity/bluez/bluez5-init/ccimx93/bluetooth-init

@@ -47,6 +47,8 @@ bluetooth_start() {
 	fi
 
 	hciattach -t5 /dev/ttyBt any -s 3000000 3000000 flow && \
+	hciconfig ${HCI_IFACE} up && \
+	sleep 0.2 && \
 	log "Bluetooth activated" && return
 
 	log "[ERROR] Cannot initialize Bluetooth"