arm64: dts: librem5: Add interconnect name for DCSS

Otherwise it fails to probe indicated by

    [   30.524888] imx-dcss 32e00000.display-controller: No interconnect support may cause display underflows!

Closes: #262
Signed-off-by: Guido Günther <agx@sigxcpu.org>
2 jobs for mrs/dcss-interconnct in 64 minutes and 45 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #323244
librem5 allowed to fail
build:aarch64

00:09:18

passed #323245
librem5:arm64
build:deb

01:04:44

 
Name Stage Failure
failed
build:aarch64 Build
  CC [M]  drivers/hid/hid-sensor-hub.o
CC [M] drivers/hid/hid-sensor-custom.o
LD [M] drivers/hid/hid-picolcd.o
LD [M] drivers/hid/hid-uclogic.o
LD [M] drivers/hid/wacom.o
AR drivers/hid/built-in.a
LD [M] drivers/hid/hid-wiimote.o
AR drivers/built-in.a
ERROR: Job failed: exit code 1