UPSTREAM: usb: gadget: uvc: track frames in format entries

Just like the header is tracking the formats in a linked list, in this
patch we track the frames in a linked list of the formats. It
simplifies the parsing of the configfs structure.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>

Link: https://lore.kernel.org/r/20220421211427.3400834-6-m.grzeschik@pengutronix.de


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

(cherry picked from commit a2673d57)
Bug: 242344221
Change-Id: I8d3e4ba5b13cad2f195400ef4de5c8e196e25a8a
Signed-off-by: Avichal Rakesh <arakesh@google.com>