Kernel minimization (#334)

* adds patch to remove unused kernel components

* new boards, rebase patches to match

* rename boards for deployment

boards/nordic/nrf52840_dongle_opensk/Makefile

@@ -0,0 +1,28 @@
+# Makefile for building the tock kernel for the nRF development kit
+
+TARGET=thumbv7em-none-eabi
+PLATFORM=nrf52840_dongle_opensk
+
+include ../../Makefile.common
+
+TOCKLOADER=tockloader
+
+# Where in the nrf52 flash to load the kernel with `tockloader`
+KERNEL_ADDRESS=0x00000
+
+# Upload programs over uart with tockloader
+ifdef PORT
+  TOCKLOADER_GENERAL_FLAGS += --port $(PORT)
+endif
+
+TOCKLOADER_JTAG_FLAGS = --jlink --board nrf52dk
+
+# Upload the kernel over JTAG
+.PHONY: flash
+flash: $(TOCK_ROOT_DIRECTORY)target/$(TARGET)/release/$(PLATFORM).bin
+	$(TOCKLOADER) $(TOCKLOADER_GENERAL_FLAGS) flash --address $(KERNEL_ADDRESS) $(TOCKLOADER_JTAG_FLAGS) $<
+
+# Upload the kernel over serial/bootloader
+.PHONY: program
+program: $(TOCK_ROOT_DIRECTORY)target/$(TARGET)/release/$(PLATFORM).hex
+	$(error Cannot program nRF52840-Dongle over USB. Use \`make flash\` and JTAG)