Update .gitignore

Removing .gitignore changes irrelevant to issue #502

Author: orrmany

.gitignore

@@ -20,7 +20,3 @@
 # Ignore local overrides of platform.txt and boards.txt,
 /boards.local.txt
 /platform.local.txt
-
-# Ignore S340 SoftDevice due to license restrictions
-bootloader/feather_nrf52840_express/feather_nrf52840_express_bootloader-*s340*
-cores/nRF5/nordic/softdevice/s340_nrf52_6.1.1_API/*