bnxt_en: Fix implementation of tx push operation.

bnxt_en: Fix implementation of tx push operation.

Orabug: 23221795

tx push is supported for small packets to reduce DMA latency.  The
following bugs are fixed in this patch:

1. Fix the definition of the push BD which is different from the DMA BD.
2. The push buffer has to be zero padded to the next 64-bit word boundary
or tx checksum won't be correct.
3. Increase the tx push packet threshold to 164 bytes (192 bytes with the BD)
so that small tunneled packets are within the threshold.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 4419dbe6a0f031ddb2df4cd993805546a566d20e)
Signed-off-by: Brian Maly <brian.maly@oracle.com>