rtw89: Fix two spelling mistakes in debug messages

There are two spelling mistakes in rtw89_debug messages. Fix them.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211015105004.11817-1-colin.king@canonical.com