does not build for 5.4-rc3

[axxapy]

5.4 has nvme support
Unfortunately bce does not build under 5.4:

make -C /lib/modules/5.4.0-1-MANJARO/build M=/home/tmp/mbp2018-bridge-drv modules
make[1]: Entering directory '/usr/lib/modules/5.4.0-1-MANJARO/build'
  CC [M]  /home/tmp/mbp2018-bridge-drv/vhci/vhci.o
/home/tmp/mbp2018-bridge-drv/vhci/vhci.c: In function ‘bce_vhci_create’:
/home/tmp/mbp2018-bridge-drv/vhci/vhci.c:47:20: error: ‘struct usb_bus’ has no member named ‘uses_dma’
   47 |     vhci->hcd->self.uses_dma = 1;
      |                    ^
make[2]: *** [scripts/Makefile.build:266: /home/tmp/mbp2018-bridge-drv/vhci/vhci.o] Error 1
make[1]: *** [Makefile:1649: /home/tmp/mbp2018-bridge-drv] Error 2
make[1]: Leaving directory '/usr/lib/modules/5.4.0-1-MANJARO/build'
make: *** [Makefile:9: all] Error 2