Revert "ath79: append/prepad okli kernel support"

This patch is for CSAC support. As it was dropped, this can go too.

This reverts commit ce6fd478a3.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

target/linux/ath79/image/Makefile

@@ -68,16 +68,6 @@ define Build/relocate-kernel
 	rm -rf $@.relocate
 endef
 
-define Build/append-okli-kernel
-	dd if="$(KDIR)/loader-$(word 1,$(1)).uImage" >> "$@"
-endef
-
-define Build/prepad-okli-kernel
-  -[ -f "$@" ] && \
-  dd if="$(KDIR)/loader-$(word 1,$(1)).uImage" of="$@".tmp bs=64k conv=sync && \
-  cat "$@" >>"$@".tmp && \
-  mv "$@".tmp "$@"
-endef
 
 define Device/Default
   DEVICE_DTS_DIR := ../dts