default or selected kernelversion does not have config value CONFIG_DRM_PSB_MRST.
Result is shown for kernelversion 6.2.5

Intel GMA600 support (Experimental)

configname: CONFIG_DRM_PSB_MRST

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Intel GMA600 support (Experimental)
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say yes to include support for GMA600 (Intel Moorestown/Oaktrail)
platforms with LVDS ports. HDMI and MIPI are not currently
supported.