wifi: mt76: mt7996: fix EMI rings for RRO

wifi: mt76: mt7996: fix EMI rings for RRO

The RRO EMI rings only need to be allocated when WED is not active.
This patch fixes command timeout issue for the setting of WED off and
RRO on.

Fixes: 3a29164425e9 ("wifi: mt76: mt7996: Add SW path for HW-RRO v3.1")
Co-developed-by: Rex Lu <rex.lu@mediatek.com>
Signed-off-by: Rex Lu <rex.lu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20251106064203.1000505-12-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>