Commit 9302fb05a0c6 "x11/nvidia-driver: Fix build after kva_layout" accidentally broke builds for x11/nvidia-driver-304 and x11/nvidia-driver-340.
Fix builds for these 2 slave (child) ports.
Other slave ports are not affected with this breakage.
As this fixes builds for specific slaves only, intentionally did NOT bumped PORTREVISION.
Reported by: pkg-fallout