deploy: Drop fsync of modified config files

These fsyncs were added for what turned out to be a fairly bogus
reason; I was hitting read errors from extlinux after upgrades and out
of conservatisim tried adding fsync calls, but the *actual* problem
was that extlinux didn't support 64 bit ext4.  Now that at least for
Project Atomic hosts we're just targeting grub2, we can drop these
fsync calls and rely on `syncfs()` being both faster and catching any
errors.

1 files changed, 0 insertions, 0 deletions

diff --git a/libglnx b/libglnx
-Subproject 381ca54ee3a47de291d26a5db8772732fb4a9d5
+Subproject 371172bcfd869867cf1c2847fcbbb3aa22adddb