Add host OS detection quirk.

[HiFiPhile]

Describe the PR
Due to the nature of quirk I'm not sure where to put...

This 1st OS detection quirk mainly resolve UAC class issue. Windows and OSX demand different feedback endpoint size for FS as Windows doesn't implement UAC spec correctly (Linux is compatible with both).
So there needs a way to adjust Configuration Descriptor on the fly.

[HiFiPhile]

@Marcus2060 @kf6gpe @rhysmorgan134

A quirk is come out which (hopefully) resolve UAC feedback format issue, test welcomed.

Now it's possible to use different Config descriptors:

uint8_t const desc_configuration_default[] =
{
    // Config number, interface count, string index, total length, attribute, power in mA
    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 500),
    // Interface number, Alternate count, starting string index, attributes, detach timeout, transfer size
    TUD_DFU_DESCRIPTOR(ITF_NUM_DFU, 1, 4, DFU_ATTR_CAN_UPLOAD | DFU_ATTR_CAN_DOWNLOAD | DFU_ATTR_MANIFESTATION_TOLERANT, 100, CFG_TUD_DFU_XFER_BUFSIZE),
};

uint8_t const desc_configuration_osx[] =
{
    // Config number, interface count, string index, total length, attribute, power in mA
    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL_OSX, 0, CONFIG_TOTAL_LEN_OSX, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 500),
     // 1st CDC: Interface number, string index, EP notification address and size, EP data address (out, in) and size.
    TUD_CDC_DESCRIPTOR(ITF_NUM_CDC_0, 4, EPNUM_CDC_0_NOTIF, 8, EPNUM_CDC_0_OUT, EPNUM_CDC_0_IN, 64),
};

// Invoked when received GET CONFIGURATION DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
{
    (void) index; // for multiple configurations

    return  (tud_quirk_host_os_hint() == TUD_QUIRK_OS_HINT_OSX) ? desc_configuration_osx: desc_configuration_default;
}

[rhysmorgan134]

I'll have a go at building into my current project, may take a while as I few bits I think I need to get my head around to get it in there working. Thanks for looking into it!