staging: rtl8723bs: remove hal_btcoex_SetManualControl

Remove function hal_btcoex_SetManualControl because it is not used.

Signed-off-by: Nam Cao <namcaov@gmail.com>
Link: https://lore.kernel.org/r/ae83ad941013d7a6c47d06f70c0f43087fe2c84f.1662111799.git.namcaov@gmail.com


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