wifi: rtw89: update DMA function with different generation

The register of control and polling function for TX/RX DMA is different
from different generation, so update them. Also rename polling_dma
function to polling_dma_idle to avoid misunderstanding.

Signed-off-by: Chin-Yen Lee <timlee@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240302005828.13666-4-pkshih@realtek.com