busybox: send resume actions to the background

Make the script send the resume actions to the background
so that console returns to the user without having to wait
for the Wi-Fi module to load and the Bluetooth to attach.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>

https://onedigi.atlassian.net/browse/DEL-8262

meta-digi-dey/recipes-core/busybox/busybox/standby

@@ -76,6 +76,8 @@ resume_interfaces() {
 
 	# Resume NetworkManager after suspend
 	${NM_DAEMON} start
+
+	exit_critical_section
 }
 
 enter_critical_section() {
@@ -110,9 +112,7 @@ if [ -f "${syspower}" ]; then
 	printf "mem" > ${syspower}
 
 	# Post-resume actions
-	resume_interfaces
-
-	exit_critical_section
+	resume_interfaces &
 else
 	printf "\n[ERROR] File ${syspower} not found\n\n"
 fi