USB: composite: Increase the IN endpoint buffer allocation

Some UDC may require allocation of some extra bytes for
TX buffer due to hardware requirement. Add necessary
changes for the same.

Change-Id: Ia0ec21bbbe7d514f840f482d0e063559d4231338
Signed-off-by: Sujeet Kumar <ksujeet@codeaurora.org>
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>