CONFIG_BF537_PORT_G is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF537_PORT_G.
Result is shown for kernelversion 5.11.21

Select BF537/6/4 default GPIO PFx PORTG

configname: CONFIG_BF537_PORT_G

Select BF537/6/4 default GPIO PFx PORTx
└─>Select BF537/6/4 default GPIO PFx PORTG
In linux kernel since version 2.6.22 (release Date: 2007-07-08)  
Quick Hack for BF537/6/4 default GPIO PFx PORTG.

depends
CONFIG_BF534 or CONFIG_BF536 or CONFIG_BF537