Remove references to bootloader from Makefile

Makefile

@@ -18,18 +18,14 @@ else
 	MAKEFLAGS += PRN=$(PRN)
 endif
 
-.PHONY: all tests firmware bootloader docs .FORCE
+.PHONY: all tests firmware docs .FORCE
 
-all: firmware # bootloader tests
+all: firmware # tests
 
 firmware: libopencm3/lib/libopencm3_stm32f4.a libswiftnav/build/src/libswiftnav-static.a
 	@printf "BUILD   src\n"; \
 	$(MAKE) -r -C src $(MAKEFLAGS)
 
-bootloader:
-	@printf "BUILD   bootloader\n"; \
-	$(MAKE) -r -C bootloader $(MAKEFLAGS)
-
 tests:
 	$(Q)for i in tests/*; do \
 		if [ -d $$i ]; then \
@@ -51,8 +47,6 @@ libswiftnav/build/src/libswiftnav-static.a: .FORCE
 clean:
 	@printf "CLEAN   src\n"; \
 	$(MAKE) -C src $(MAKEFLAGS) clean
-	@printf "CLEAN   bootloader\n"; \
-	$(MAKE) -C bootloader $(MAKEFLAGS) clean
 	@printf "CLEAN   libopencm3\n"; \
 	$(MAKE) -C libopencm3 $(MAKEFLAGS) clean
 	@printf "CLEAN   libswiftnav\n"; \