Revert "ext4: fixup 64-bit divides in 3.0-stable backport of upstream fix"

This reverts commit 7f2aad725951de989ffe30eb4617e39763db8ace.
Revert "ext4: use atomic64_t for the per-flexbg free_clusters count"

This reverts commit 503f4bdcc078e7abee273a85ce322de81b18a224.
SC03D:Update Defconfig