virtio_blk: cleanups: remove check obsoleted by CONFIG_LBDAF removal

virtio_blk: cleanups: remove check obsoleted by CONFIG_LBDAF removal

Prior to 72deb455b5ec ("block: remove CONFIG_LBDAF"), it was optional if
the 32-bit kernel support block device and/or file sizes larger than 2 TiB
(considering the sector size is 512 bytes)
But now sector_t and blkcnt_t are always 64-bit in size.

Suggested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sohaib Mohammed <sohaib.amhmd@gmail.com>
Link: https://lore.kernel.org/r/20210430103611.77345-1-sohaib.amhmd@gmail.com
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>