Revert "Revert "ext4: use atomic64_t for the per-flexbg free_clusters count""

This reverts commit cb74805ca092b7e615bf952e9eea985c923b9462.
ext4: fixup 64-bit divides in 3.0-stable backport of upstream fix

Replace C division operators with div64_u64 for divides introduced in:
commit 503f4bdcc078e7abee273a85ce322de81b18a224
ext4: use atomic64_t for the per-flexbg free_clusters count

Specific to the 3.0-stable backport of the upstream patch.

Change-Id: Id10180ed16f54f58fc18531092e88f52fc6de31c
Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
NFS: fix printf type compiler warning

Change-Id: I4a7269a2b60dbe05ecd724abb7176c40f3f2baae