usb: dwc3: qcom: Snapshot driver for backwards compatibilty

In order to more tightly integrate the Qualcomm glue driver with the
dwc3 core the driver is redesigned to avoid splitting the implementation
using the driver model. But due to the strong coupling to the Devicetree
binding needs to be updated as well.

Various ways to provide backwards compatibility with existing Devicetree
blobs has been explored, but migrating the Devicetree information
between the old and the new binding is non-trivial.

For the vast majority of boards out there, the kernel and Devicetree are
generated and handled together, which in practice means that backwards
compatibility needs to be managed across about 1 kernel release.

For some though, such as the various Snapdragon laptops, the Devicetree
blobs live a life separate of the kernel. In each one of these, with the
continued extension of new features, it's recommended that users would
upgrade their Devicetree somewhat frequently.

With this in mind, simply carrying a snapshot/copy of the current driver
is simpler than creating and maintaining the migration code.

The driver is kept under the same Kconfig option, to ensure that Linux
distributions doesn't drop USB support on these platforms.

The driver, which is going to be refactored to handle the newly
introduced qcom,snps-dwc3 compatible, is updated to temporarily not
match against any compatible.

This driver should be removed after the next LTS release.

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250414-dwc3-refactor-v7-1-f015b358722d@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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