staging: rtl8723bs: Change return type of hal_btcoex_IsBtExist()

Change return type of hal_btcoex_IsBtExist from u8 to bool as its only
possible return values are true and false.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190802062444.30384-1-nishkadg.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>