hikey960: add missing arm-tf and edk2 dependencies

Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

hikey960.mk

@@ -336,7 +336,7 @@ boot-img-clean:
 # l-loader
 ################################################################################
 .PHONY: lloader
-lloader:
+lloader: arm-tf edk2
 	cd $(LLOADER_PATH) && \
 		ln -sf $(ARM_TF_PATH)/build/hikey960/$(ARM_TF_BUILD)/bl1.bin && \
 		ln -sf $(EDK2_BIN) && \