default or selected kernelversion does not have config value CONFIG_DRM_WAVESHARE_BRIDGE.
Result is shown for kernelversion 6.18-rc3

Waveshare DSI bridge

modulename: waveshare-dsi.ko

configname: CONFIG_DRM_WAVESHARE_BRIDGE

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>Display Interface Bridges
└─>Device Tree and Open Firmware support
└─>Waveshare DSI bridge
Driver for waveshare DSI to DPI bridge board.
Please say Y if you have such hardware

source code:
drivers/gpu/drm//bridge/waveshare-dsi.c