usb: gadget: udc: core: Introduce check_config to verify USB configuration

[ Upstream commit ce7d0008 ]

Some UDCs may have constraints on how many high bandwidth endpoints it can
support in a certain configuration.  This API allows for the composite
driver to pass down the total number of endpoints to the UDC so it can verify
it has the required resources to support the configuration.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/1625908395-5498-2-git-send-email-wcheng@codeaurora.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: dbe678f6 ("usb: cdns3: fix NCM gadget RX speed 20x slow than expection at iMX8QM")
Signed-off-by: Sasha Levin <sashal@kernel.org>