wifi: rtw89: 8922a: add register definitions of H2C, C2H, page, RRSR and EDCCA

Firmware H2C commands and C2H events can go via registers, so define them
accordingly. The page registers are to arrange local buffer of WiFi chip.
RRSR is to define rate selection to transmit BA or ACK. EDCCA is to set
threshold of engine detection mechanism by BB hardware.

Like other chips, define these registers and we can share the same flow.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240120003831.7014-5-pkshih@realtek.com