Force rebuild linker.config.pb even after a build error

After a build failure of linker.config.pb, we must manually remove
the temp.pb file to resume the build again after fixing the error.
By adding '--force' flag, the script will overwrite the existing
temp.pb file.

Bug: na
Test: build after an error for linker.config.pb
Change-Id: If51ba8291de49a7c0bed8771d702f61c904d3455