[intel10g] Write TDT register immediately on each transmit()
intel_app:pull() now outputs at most 100 packets per call
Revert "intel_app:pull() now outputs at most 100 packets per call"

This reverts commit 2ca01ab87285d1fd8211379647d62396cd90748d.
Revert "[intel10g] Write TDT register immediately on each transmit()"

This reverts commit f1f610c63b0939a1589ca04310c953ceacfeea2b.