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Kernel/USB: Add driver_init
section
At any one given time, there can be an abitrary number of USB drivers in the system. The way driver mapping works (i.e, a device is inserted, and a potentially matching driver is probed) requires us to have instantiated driver objects _before_ a device is inserted. This leaves us with a slight "chicken and egg" problem. We cannot call the probe function before the driver is initialised, but we need to know _what_ driver to initialise. This section is designed to store pointers to functions that are called during the last stage of the early `_init` sequence in the Kernel. The accompanying macro in `USBDriver` emits a symbol, based on the driver name, into this table that is then automatically called. This way, we enforce a "common" driver model; driver developers are not only required to write their driver and inherit from `USB::Driver`, but are also required to have a free floating init function that registers their driver with the USB Core.
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namespace Kernel::USB {
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using DriverInitFunction = void (*)();
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#define USB_DEVICE_DRIVER(driver_name) \
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DriverInitFunction driver_init_function_ptr_##driver_name __attribute__((section(".driver_init"), used)) = &driver_name::init
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class Device;
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struct USBDeviceDescriptor;
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class USBInterface;
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