Add reset for re-connect

[toyowata]

• Add module reset function
• Add support Mbed OS 5

Test result by mbed-os-example-wifi on Renesas GR-LYCHEE:

WiFi example
Mbed OS version 6.1.0

Scan:
Network: Buffalo-G-xxxx secured: WPA/WPA2 BSSID: 34:3D:C4:xx:xx:xx RSSI: -49 Ch: 8
Network: elecom2g-xxxxx secured: WPA2 BSSID: BC:5C:4C:xx:xx:xx RSSI: -82 Ch: 9
Network: SPWN_H37_xxxxxx secured: WPA/WPA2 BSSID: F0:E4:A2:xx:xx:xx RSSI: -89 Ch: 10
3 networks available.

Connecting to Buffalo-G-xxxx...
Success

MAC: 30:ae:a4:xx:xx:xx
IP: 192.168.11.24
Netmask: 255.255.255.0
Gateway: 192.168.11.1
RSSI: 0


Done