Revert "r8169: add DASH support for RTL8127AP"

This reverts commit 17e9f841dd227a4dc976b22d000d5f669bc14493.

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 <[e-mail]>
Link: https://lore.kernel.org/20251201224238.GA604467@ax162
Fixes: 17e9f841dd22 ("r8169: add DASH support for RTL8127AP")
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/realtek/r8169_main.c

···
 	case RTL_GIGA_MAC_VER_51 ... RTL_GIGA_MAC_VER_52:
 		return RTL_DASH_EP;
 	case RTL_GIGA_MAC_VER_66:
-	case RTL_GIGA_MAC_VER_80:
 		return RTL_DASH_25_BP;
 	default:
 		return RTL_DASH_NONE;