v4l2: add QV4L2MemoryTransfer::ioctl


Syntactic sugar to simplify the code a little.

Pick-to: 6.12
Change-Id: I2d2fb9fc546cca3f471ff36287c8867ec3d47523
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
commit69cc21dbe261ce555fec44be19058866a89dc5d1
parentd55719ed99893b93c5860132b4590d186c76f546
authorTim Blechmann <tim.blechmann@qt.io>
committerTim Blechmann <tim.blechmann@qt.io>
commit timeWed, 21 Oct 2026 13:19:38 +0000