default or selected kernelversion does not have config value CONFIG_VIDEO_ROCKCHIP_VPU.
Result is shown for kernelversion 6.5.1

Rockchip VPU driver

modulename: rockchip-vpu.ko


Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Media staging drivers
└─>Multimedia support
└─>Rockchip VPU driver
In linux kernel since version 5 (release Date: 2019-03-03)  
Support for the Video Processing Unit present on Rockchip SoC,
which accelerates video and image encoding and decoding.
To compile this driver as a module, choose M here: the module
will be called rockchip-vpu.

source code: