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upd985xx USB slave patch

Hi Folks

Attached is a patch for the upd985xx USB slave. This patch fixes a
problem when the ep0 maximum payload length is not 8. RedHat have an
internal patch which has not yet been contributed which changes the
default to 64. (This patch does not require that patch).

The problem occurs when replying with less bytes then requested. If
this happens and the reply is a multiple of the maximum payload size,
a zero byte packet must be appended. The current code has a hardcoded
8 for the maximum packet size. This patch changes it to use the CDL
configured value.

The patch also adds some clarification has to how the maximum
payload size is determined from the CDL options.

        Andrew

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