default or selected kernelversion does not have config value CONFIG_PCIE_AMD_MDB.
Result is shown for kernelversion 6.6.86

AMD MDB Versal2 PCIe controller

modulename: pcie-amd-mdb.ko

configname: CONFIG_PCIE_AMD_MDB

Linux Kernel Configuration
└─>Device Drivers
└─>PCI support
└─>PCI controller drivers
└─>DesignWare-based PCIe controllers
└─>AMD MDB Versal2 PCIe controller
In linux kernel since version 6.6.86 (release Date: 2025-04-07)  
Say Y here if you want to enable PCIe controller support on AMD
Versal2 SoCs. The AMD MDB Versal2 PCIe controller is based on
DesignWare IP and therefore the driver re-uses the DesignWare
core functions to implement the driver.

source code:

depends
CONFIG_OF
CONFIG_PCI
CONFIG_PCI_MSI
CONFIG_ARM64 or CONFIG_COMPILE_TEST