staging: rtl8723bs: Replace hal_btcoex_Initialize()

staging: rtl8723bs: Replace hal_btcoex_Initialize()

Remove hal_btcoex_Initialize as all it does is perform a memset and call
EXhalbtcoutsrc_InitlizeVariables.
Rename EXhalbtcoutsrc_InitlizeVariables to hal_btcoex_Initialize and add
the memset of hal_btcoex_Initialize in order to maintain compatibility
with call sites of the latter (EXhalbtcoutsrc is not called anywhere
else except in now-removed old hal_btcoex_Initialize).
Change return type of new hal_btcoex_Initialize from u8 to void and
remove its return statement as the return value of hal_btcoex_Initialize
is never used.
Change the type of function argument at call site to match the function
parameter of new hal_btcoex_Initialize.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190802062444.30384-4-nishkadg.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>