CONFIG_BCM3384 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_BCM3384.
Result is shown for kernelversion 5.4.159

Broadcom BCM3384 based boards

configname: CONFIG_BCM3384

System type
└─>Broadcom BCM3384 based boards
In linux kernel since version 3.19 (release Date: 2015-02-08)  
Support for BCM3384 based boards. BCM3384/BCM33843 is a cable modem
chipset with a Linux application processor that is often used to
provide Samba services, a CUPS print server, and/or advanced routing
features.