dma-buf: Fix SET_NAME ioctl uapi

The uapi is the same on 32 and 64 bit, but the number isn't. Everyone
who botched this please re-read:

https://www.kernel.org/doc/html/v5.4-preprc-cpu/ioctl/botching-up-ioctls.html

Also, the type argument for the ioctl macros is for the type the void
__user *arg pointer points at, which in this case would be the
variable-sized char[] of a 0 terminated string. So this was botched in
more than just the usual ways.

Cc: Sumit Semwal <[email protected]>
Cc: Chenbo Feng <[email protected]>
Cc: Greg Hackmann <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Martin Liu <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Tested-by: Martin Liu <[email protected]>
Reviewed-by: Martin Liu <[email protected]>
Signed-off-by: Sumit Semwal <[email protected]>
  [sumits: updated some checkpatch fixes, corrected author email]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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