Add rockchip-rk3588 board family to armbian-hardware-optimization (#4838)

* Add rockchip-rk3588 board family to armbian-hardware-optimization

* Update armbian-hardware-optimization

packages/bsp/common/usr/lib/armbian/armbian-hardware-optimization

@@ -75,14 +75,14 @@ prepare_board() {
 		echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
 
 		case ${BOARDFAMILY} in
-			station* | media)
+			station* | media | rockchip-rk3588)
 				prefix="/sys/devices/system/cpu"
 				CPUFreqPolicies=($(ls -d ${prefix}/cpufreq/policy? | sed 's/freq\/policy//'))
 				if [ ${#CPUFreqPolicies[@]} -eq 1 -a -d "${prefix}/cpufreq" ]; then
 					# if there's just a single cpufreq policy ondemand sysfs entries differ
 					CPUFreqPolicies=${prefix}
 				fi
-				for i in ${CPUFreqPolicies[@]}; do
+				for i in "${CPUFreqPolicies[@]}"; do
 					affected_cpu=$(tr -d -c '[:digit:]' <<< ${i})
 					echo ondemand > ${prefix}/cpu${affected_cpu:-0}/cpufreq/scaling_governor
 					echo 1 > ${i}/cpufreq/ondemand/io_is_busy