block: move some wbt helpers to blk-wbt.c
A few helpers are only used from blk-wbt.c, so move them there, and put wbt_track() behind the CONFIG_BLK_WBT typedef. This is in preparation for changing how the wbt flags are tracked. Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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