rtwn: make sure to not write in upper bits of txdseq
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Authored by avg on Jun 18 2021, 3:00 PM.

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rG7544c1d20d8b: rtwn: make sure to not write in upper bits of txdseq

Summary

ni_txseqs is kept as 16-bit counter, but we need to trim the upper four
bits as they may have special meanings for the firware.
For instance, bit 15 enables hardware / firmware generation of sequence
numbers that overrides sequence numbers programmed by the driver.