wifi: rtw89: pci: update SER timer unit and timeout time

Be higher resolution of SER timer unit from 32ms to 16ms to detect
abnormal situation more accurately, and set hardware watchdog timer to 4ms.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240121071826.10159-2-pkshih@realtek.com