staging: rtl8723bs: Convert timers to use timer_setup()

staging: rtl8723bs: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. This performs some refactoring to
remove needless wrapper functions, and adds a pointer back to the desired
adapter.

Cc: Greg Kroah-Hartman <[email protected]>
Cc: Shreeya Patel <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Larry Finger <[email protected]>
Cc: Himanshu Jha <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Derek Robson <[email protected]>
Cc: Harsha Sharma <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: yuan linyu <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>