image: drop unused 'BuildKernel/MkFIT'

The 'MkFIT' recipe is no longer used across whole codebase.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

include/image.mk

@@ -137,14 +137,6 @@ define Image/BuildKernel/MkuImage
 		-n '$(call toupper,$(ARCH)) $(VERSION_DIST) Linux-$(LINUX_VERSION)' -d $(4) $(5)
 endef
 
-define Image/BuildKernel/MkFIT
-	$(TOPDIR)/scripts/mkits.sh \
-		-D $(1) -o $(KDIR)/fit-$(1).its -k $(2) $(if $(3),-d $(3)) -C $(4) -a $(5) -e $(6) \
-		-c $(if $(DEVICE_DTS_CONFIG),$(DEVICE_DTS_CONFIG),"config-1") \
-		-A $(LINUX_KARCH) -v $(LINUX_VERSION)
-	PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage -f $(KDIR)/fit-$(1).its $(KDIR)/fit-$(1)$(7).itb
-endef
-
 ifdef CONFIG_TARGET_IMAGES_GZIP
   define Image/Gzip
 	rm -f $(1).gz