wifi: mt76: mt792x: add MT7927-specific PCIe DMA support

Add the MT7927-specific PCIe DMA queue layout and local DMA setup,
including the extra RX ring and WFDMA/prefetch programming.

MT7927 does not follow the mt7925 DMA configuration, so provide a
separate DMA init path while reusing the existing common queue setup.

This keeps the chip-specific changes local and prepares the driver
for later MT7927 enablement without affecting existing devices.

Co-developed-by: Javier Tia <floss@jetm.me>
Signed-off-by: Javier Tia <floss@jetm.me>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260425195011.790265-17-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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