make platformio.ini even more modular

arch/nrf52/nrf52.ini

@@ -0,0 +1,20 @@
+[nrf52_base]
+; Instead of the standard nordicnrf52 platform, we use our fork which has our added variant files
+; platform = nordicnrf52 ;pending https://github.com/platformio/builder-framework-arduino-nrf5/pull/7
+platform = https://github.com/meshtastic/platform-nordicnrf52.git#merge
+
+extends = arduino_base
+build_type = debug ; I'm debugging with ICE a lot now
+; note: liboberon provides the AES256 implementation for NRF52 (though not using the hardware acceleration of the NRF52840 - FIXME)
+build_flags = 
+  ${arduino_base.build_flags} -Wno-unused-variable 
+  -Isrc/platform/nrf52
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<platform/esp32/> -<platform/stm32wl> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/> -<platform/rp2040>
+lib_ignore =
+  BluetoothOTA
+  
+; Note: By default no lora device is created for this build - it uses a simulated interface
+[env:feather_nrf52832]
+extends = nrf52_base
+board = adafruit_feather_nrf52832  

arch/nrf52/nrf52840.ini

@@ -0,0 +1,14 @@
+[nrf52840_base]
+extends = nrf52_base
+build_flags = ${nrf52_base.build_flags} 
+lib_deps =
+  ${arduino_base.lib_deps}
+  ${environmental_base.lib_deps}
+  https://github.com/Kongduino/Adafruit_nRFCrypto.git
+
+; Note: By default no lora device is created for this build - it uses a simulated interface
+[env:nrf52840dk]
+extends = nrf52840_base
+board = nrf52840_dk
+
+