Flag punch hole changes with build time flag

Adding ENABLE_PUNCH_HOLES flag to enable punch hole changes in
JNI.

Test: acloud delete --all && m && acloud create --local-instance --local-image && adb logcat -c && m FileSystemUtilsTests && atest -c FileSystemUtilsTests
Bug: 301631861
Change-Id: I611893e3171e0a2334e4d49b195768cdfb57fb96
2 files changed