I dunno if possible but maybe this lights up the whole a lil bit. See code in init.amlogic.rc:

service loadmtk /system/bin/insmod /system/lib/btmtksdio.ko
    #user bluetooth
    #class main
    #group bluetooth net_bt_stack
    disabled
    oneshot
service remtk /system/bin/rmmod /system/lib/btmtksdio.ko
    #user bluetooth
    #class main
    #group bluetooth net_bt_stack
    disabled
    oneshot
on property:bluetooth.btdriver.mtk=true
    start loadmtk
on property:bluetooth.btdriver.mtk=false
    start remtk
service loadrtk /system/bin/insmod /system/lib/rtk_btusb.ko
    #user bluetooth
    #class main
    #group bluetooth net_bt_stack
    disabled
    oneshot
service rertk /system/bin/rmmod /system/lib/rtk_btusb.ko
    #user bluetooth
    #class main
    #group bluetooth net_bt_stack
    disabled
    oneshot