UPSTREAM: usb: gadget: composite: Show warning if function driver's descriptors are incomplete.

In the config_ep_by_speed_and_alt function, select the corresponding
descriptor through g->speed. But some legacy or not well designed
function drivers may not support the corresponding speed. So, we can
directly display warnings instead of causing kernel panic. At the
same time, it indicates the reasons in warning message.

Reviewed-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Qihang Hu <huqihang@oppo.com>
Link: https://lore.kernel.org/r/20211110101129.462357-1-huqihang@oppo.com


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

(cherry picked from commit 16d42759)
Bug: 259171206
Change-Id: I5ceff4871e1e7693c7a2c68264e994f39194090b
Signed-off-by: Avichal Rakesh <arakesh@google.com>