nrf52: cleanup s140v7 uf2 targets

targets/nano-33-ble-s140v7-uf2.json

@@ -0,0 +1,6 @@
+{
+	"inherits": ["nrf52840", "nrf52840-s140v7-uf2"],
+	"build-tags": ["nano_33_ble"],
+	"serial-port": ["acm:239a:8063", "acm:239a:0063"],
+	"msd-volume-name": "NANO33BOOT"
+}

targets/nrf52840-s140v7-uf2.json

@@ -0,0 +1,11 @@
+{
+	"inherits": ["nrf52840-s140v7"],
+	"build-tags": ["nrf52840_reset_uf2"],
+	"linkerscript": "targets/nrf52840-s140v7-uf2.ld",
+	"serial": "usb",
+	"flash-1200-bps-reset": "true",
+	"flash-method": "msd",
+	"msd-firmware-name": "firmware.uf2",
+	"binary-format": "uf2",
+	"uf2-family-id": "0xADA52840"
+}

targets/xiao-ble.ld → targets/nrf52840-s140v7-uf2.ld

@@ -1,4 +1,3 @@
-
 /*
   See also 
   https://github.com/Seeed-Studio/ArduinoCore-mbed/blob/master/variants/SEEED_XIAO_NRF52840_SENSE/linker_script.ld

targets/xiao-ble.json

@@ -1,13 +1,6 @@
 {
-	"inherits": ["nrf52840"],
-	"build-tags": ["xiao_ble", "nrf52840_reset_uf2", "softdevice", "s140v7"],
-	"serial": "usb",
+	"inherits": ["nrf52840", "nrf52840-s140v7-uf2"],
+	"build-tags": ["xiao_ble"],
 	"serial-port": ["acm:2886:8045", "acm:2886:0045"],
-	"flash-1200-bps-reset": "true",
-	"flash-method": "msd",
-	"msd-volume-name": "XIAO-SENSE",
-	"msd-firmware-name": "firmware.uf2",
-	"binary-format": "uf2",
-	"uf2-family-id": "0xADA52840",
-	"linkerscript": "targets/xiao-ble.ld"
+	"msd-volume-name": "XIAO-SENSE"
 }