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