Move persist.img build rules to another repository This commit moves the persist.img build rules to another repository because "device/google/sunfish" is a part of aosp-without-vendor source tree but it depends on some files that do NOT belong to aosp-without-vendor source tree. Bug: 141967269 Test: lunch sunfish-userdebug && make Change-Id: Iaf84339ca858bd034cb9454e06c62923f60cbab6 Signed-off-by: achigoliu <achigoliu@google.com>