io_uring: update buffer update feature testing
io_uring: update buffer update feature testing

IORING_FEAT_RSRC_TAGS came late, and it's the best way to check if a
ring supports resource (i.e. buffer or file) tagging and dynamic buffer
updates.

Signed-off-by: Pavel Begunkov <8608d41fe50396a9dbd36e830be65ba791e26c05@gmail.com>
Link: https://lore.kernel.org/r/de5fd2626bd4eabd0eec3eb8310888b4eb1a2539.1629976377.git.8608d41fe50396a9dbd36e830be65ba791e26c05@gmail.com
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing