Revert "r8169: add DASH support for RTL8127AP"

This reverts commit 17e9f841.

Nathan reports error messages appearing in dmesg since commit
under Fixes:

  [    3.844125] r8169 0000:01:00.0 (unnamed net_device) (uninitialized): rtl_eriar_cond == 0 (loop: 100, delay: 100).
  [    3.864844] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).
  [    3.878825] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).
  [    3.892632] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).
  [    5.002551] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).
  [    5.016286] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).
  [    5.030027] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).

Let's drop the bad change and revisit in the next release cycle.

Repoted-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/20251201224238.GA604467@ax162


Fixes: 17e9f841 ("r8169: add DASH support for RTL8127AP")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>