Change core name to siwigsm

* Add platform flag

Signed-off-by: Ajay Bhargav <[email protected]>

Author: ajaybhargav

boards/s20gsm.json

@@ -1,12 +1,13 @@
 {
 	"build": {
-		"core": "s20",
+		"core": "siwigsm",
 		"cpu": "arm9ejs",
 		"f_cpu": "260000000L",
 		"mcu": "MT2503",
 		"variant": "s20u",
 		"newlib": "nano",
 		"siwilib": "release",
+		"extra_flags": "-DPLATFORM_S20U=1",
 		"hwids": [
 			[
 				"0x0E8D",
@@ -15,9 +16,9 @@
 		]
 	},
 	"connectivity": [
-		"GSM",
-		"Bluetooth",
-		"GPS"
+		"gsm",
+		"bluetooth",
+		"gps"
 	],
 	"frameworks": [
 		"arduino",