Makefile: Remove selective cache

image.mk

@@ -14,10 +14,6 @@ FROM := $(shell grep FROM Dockerfile | cut -d" " -f2)
 VERSION := $(shell basename `pwd`)
 IMAGE := $(IMAGE_PREFIX)$(VERSION):$(VARIANT)
 
-ifeq (${DOCKER_ALL_CACHE},)
-DOCKER_CACHE := --cache-from "$(IMAGE)"
-endif
-
 all: pull build
 
 pull:
@@ -25,7 +21,7 @@ pull:
 	docker pull "$(FROM)"
 
 build:
-	docker build $(DOCKER_CACHE) --tag "$(IMAGE)" .
+	docker build --cache-from "$(IMAGE)" --tag "$(IMAGE)" .
 
 push:
 	docker push "$(IMAGE)"