UPSTREAM: usb: gadget: uvc: add v4l2 enumeration api calls

This patch adds support to the v4l2 VIDIOCs for enum_format,
enum_framesizes and enum_frameintervals. This way, the userspace
application can use these VIDIOCS to query the via configfs exported
frame capabilities. With thes callbacks the userspace doesn't have to
bring its own configfs parser.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220909221335.15033-4-m.grzeschik@pengutronix.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit 588b9e85)
Bug: 259171206
Change-Id: I26bf3a509158da6f521c2e62076ef014cf0235b8
Signed-off-by: Avichal Rakesh <arakesh@google.com>
(cherry picked from commit 55c758d5)