CustomHID: support different report descriptor sizes, fixes #15

[XelaRellum]

Right now if you have more than 1 CustomHID interface, all interfaces have report descriptors of the same size.

Support different sizes by adding an entry to USBD_CUSTOM_HID_ItfTypeDef. The default is USBD_CUSTOM_HID_REPORT_DESC_SIZE, so this is backwards compatible.

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[TOUNSTM]

Hello @XelaRellum,

Thank you for this report. We will get back to you as soon as we analyze it further. This may take some time. Thank you for your comprehension.

With Regards,

[ALABSTM]

ST Internal Reference: 173362