default or selected kernelversion does not have config value CONFIG_B44.
Result is shown for kernelversion 6.0-rc7

Broadcom 440x/47xx ethernet support

modulename: b44.ko
configname: CONFIG_B44

Linux Kernel Configuration
└─> Device Drivers
└─> Network device support
└─> Ethernet driver support
└─> Broadcom 440x/47xx ethernet support

If you have a network (Ethernet) controller of this type, say Y
or M here.

To compile this driver as a module, choose M here. The module
will be called b44.

source code: