default or selected kernelversion does not have config value CONFIG_COMMON_CLK_MT8196_VDECSYS.
Result is shown for kernelversion 6.18-rc7

Clock driver for MediaTek MT8196 vdecsys

modulename: clk-mt8196-vdec.ko

configname: CONFIG_COMMON_CLK_MT8196_VDECSYS

Linux Kernel Configuration
└─>Device Drivers
└─>Common Clock Framework
└─>Clock driver for MediaTek SoC
└─>Clock driver for MediaTek MT8196 vdecsys
In linux kernel since version 6.12.57 (release Date: 2025-11-02)  
This driver supports MediaTek MT8196 vdecsys clocks.

source code:
drivers/clk/mediatek/clk-mt8196-vdec.c