drm/vc4: probe regression with arm64/defconfig

Hi,

today i accidently found a regression on the Raspberry Pi 3 with arm64/defconfig (bcm2835_defconfig and multi_v7_defconfig are not affected) in current 4.18.

Symptoms: Raspberry Pi 3 boots to serial console, but vc4 won't probe (no vc4 in the kernel messages) and the display stays black

I didn't had the chance to narrow down the issue to the relevant commit. All i can say is that 4.17 isn't affected, but 4.18rc1 is.

Maybe some of you guys have an idea?

Best regards Stefan