include/rootfs: skip removal of APK cache now deprecated

Skip removal of APK cache since now deprecated as APK doesn't make use
of cache anymore in our configuration.

Signed-off-by: Christian Marangi <[email protected]>

include/rootfs.mk

@@ -111,7 +111,6 @@ define prepare_rootfs
 	)
 
 	@-find $(1) -name CVS -o -name .svn -o -name .git -o -name '.#*' | $(XARGS) rm -rf
-	@-find $(1)/usr/cache/apk/ -name '*.apk' -delete
 	rm -rf \
 		$(1)/boot \
 		$(1)/tmp/* \