usb: uvc: allow the host to use short probe/commit messages

Some OSes like MacOS use shorter UVC 1.1 probe/commit messages even when
UVC 1.5 is supported, without bUsage, bBitDepthLuma, bmSettings,
bMaxNumberOfRefFramesPlus1, bmRateControlModes bmLayoutPerStream.
Accept messages of arbitrary size to safely be processed, ignoring all
missing fields, improving standard compliance.

Signed-off-by: Josuah Demangeon <me@josuah.net>