wifi: mt76: mt7996: fix MLD group index assignment

wifi: mt76: mt7996: fix MLD group index assignment

[ Upstream commit 4fb3b4e7d1ca5453c6167816230370afc15f26bf ]

Fix extender mode and MBSS issues caused by incorrect assignment of the
MLD group and remap indices.

Fixes: ed01c310eca9 ("wifi: mt76: mt7996: Fix mt7996_mcu_bss_mld_tlv routine")
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20251106064203.1000505-9-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>