Add support for non-byte tdata widths in AXI stream VCs.#1128
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The AXI standard is limited to byte-oriented data buses and specifies the width of tkeep and tstrb as tdata'length / 8. To support the use of non-byte tdata widths with active use of tkeep and tstrb, this has been changed to (tdata'length + 7) / 8 such that all bits in tdata are covered by a bit in tkeep and tstrb.
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Added support for non-byte tdata widths in AXI stream VCs. This is non-standard and must be enabled explicitly. The difference from the standard implementation is with respect to the length of tkeep and tstrb which is calculated as (tdata'length + 7) / 8 rather than tdata'length / 8 . Solves #1127.