ublk: add UBLK_U_CMD_REG_BUF/UNREG_BUF control commands

ublk: add UBLK_U_CMD_REG_BUF/UNREG_BUF control commands

Add control commands for registering and unregistering shared memory
buffers for zero-copy I/O:

- UBLK_U_CMD_REG_BUF (0x18): pins pages from userspace, inserts PFN
  ranges into a per-device maple tree for O(log n) lookup during I/O.
  Buffer pointers are tracked in a per-device xarray. Returns the
  assigned buffer index.

- UBLK_U_CMD_UNREG_BUF (0x19): removes PFN entries and unpins pages.

Queue freeze/unfreeze is handled internally so userspace need not
quiesce the device during registration.

Also adds:
- UBLK_IO_F_SHMEM_ZC flag and addr encoding helpers in UAPI header
  (16-bit buffer index supporting up to 65536 buffers)
- Data structures (ublk_buf, ublk_buf_range) and xarray/maple tree
- __ublk_ctrl_reg_buf() helper for PFN insertion with error unwinding
- __ublk_ctrl_unreg_buf() helper for cleanup reuse
- ublk_support_shmem_zc() / ublk_dev_support_shmem_zc() stubs
  (returning false — feature not enabled yet)

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://patch.msgid.link/20260331153207.3635125-2-ming.lei@redhat.com
[axboe: fixup ublk_buf_reg -> ublk_shmem_buf_reg errors, comments]
Signed-off-by: Jens Axboe <axboe@kernel.dk>