Using bossac18 on samd51 architecture

Author: LynnL4

boards.txt

@@ -29,7 +29,7 @@ seeed_wio_terminal.vid.0=0x2886
 seeed_wio_terminal.pid.0=0x802D
 seeed_wio_terminal.vid.1=0x2886
 seeed_wio_terminal.pid.1=0x002D
-seeed_wio_terminal.upload.tool=bossac
+seeed_wio_terminal.upload.tool=bossac18
 seeed_wio_terminal.upload.protocol=sam-ba
 seeed_wio_terminal.upload.maximum_size=507904
 seeed_wio_terminal.upload.offset=0x4000
@@ -314,7 +314,7 @@ seeed_grove_ui_wireless.vid.0=0x2886
 seeed_grove_ui_wireless.pid.0=0x0000
 seeed_grove_ui_wireless.vid.1=0x2886
 seeed_grove_ui_wireless.pid.1=0x0000
-seeed_grove_ui_wireless.upload.tool=bossac
+seeed_grove_ui_wireless.upload.tool=bossac18
 seeed_grove_ui_wireless.upload.protocol=sam-ba
 seeed_grove_ui_wireless.upload.maximum_size=507904
 seeed_grove_ui_wireless.upload.offset=0x4000