mariux-5.15.131-454

Commit a77a94f862 (x86/microcode: Default-disable late loading)
introduced the Kconfig option, defaulting to no, so it was disabled in
our systems as it was backported to Linux v5.15.99 (commit
6d2b3a319144f3f5148d8a2b19549ea3bb118c2e).

We want to have the option, so reenable it.