rtl_bt: Update firmware for BT part of RTL8822C

The file was sent to me by Max Chou <max.chou@realtek.com>.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Max Chou <max.chou@realtek.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>