backports: backport u64_stats_fetch_begin_irq() and u64_stats_fetch_retry_irq()

The bh version u64_stats_fetch_begin_bh() and u64_stats_fetch_retry_bh()
got dropped in favor for an IRQ safe variant. We can now remove
u64_stats_fetch_begin_bh() and u64_stats_fetch_retry_bh() as we work
carrying over what is upstream and no drivers upstream use this anymore.

Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
1 file changed