net: ena: remove code duplication in ena_com_update_nonadaptive_moderation_interval...

net: ena: remove code duplication in ena_com_update_nonadaptive_moderation_interval _*()

BugLink: https://bugs.launchpad.net/bugs/1853180
Remove code duplication in:
ena_com_update_nonadaptive_moderation_interval_tx()
ena_com_update_nonadaptive_moderation_interval_rx()
functions.

Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 57e3a5f24bb5bf265988e973a911845abcbf6a00)
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Khaled Elmously <khalid.elmously@canonical.com>
Acked-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>