default or selected kernelversion does not have config value CONFIG_FSL_DPAA2.
Result is shown for kernelversion 6.9.9

Freescale DPAA2 devices

configname: CONFIG_FSL_DPAA2

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Freescale DPAA2 devices
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Build drivers for Freescale DataPath Acceleration
Architecture (DPAA2) family of SoCs.