fear(boards): Add nrfmicro_13_52833 board

* Add nrfmicro_13_52833 board definition.

Co-authored-by: Alexander Krikun <krikun98@gmail.com>
Co-authored-by: Pete Johanson <peter@peterjohanson.com>

app/boards/arm/nrfmicro/nrfmicro_13_52833.yaml

@@ -0,0 +1,15 @@
+identifier: nrfmicro_13_52833
+name: nrfmicro_13_52833
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+supported:
+  - adc
+  - usb_device
+  - ble
+  - ieee802154
+  - pwm
+  - watchdog