default or selected kernelversion does not have config value CONFIG_KEYBOARD_TOSA_USE_EXT_KEYCODES.
Result is shown for kernelversion 5.4.194

Tosa keyboard: use extended keycodes


Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Tosa keyboard: use extended keycodes
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Say Y here to enable the tosa keyboard driver to generate extended
(>= 127) keycodes. Be aware, that they can't be correctly interpreted
by either console keyboard driver or by Kdrive keybd driver.

Say Y only if you know, what you are doing!