linux: Select MICROCODE_LATE_LOADING

[pmenzel]

As discussed in MarIuX64 issue https://github.molgen.mpg.de/mariux64/mariux64-issues/issues/83:

Turns out on systems with Linux 5.15.112 and 6.1.39 the file does not exist:

@machdoch:~$ ls -ld /sys/devices/system/cpu/microcode/reload
ls: cannot access '/sys/devices/system/cpu/microcode/reload': No such file or directory

The reason is, that the commit adding the new option CONFIG MICROCODE_LATE_LOADING, introduced in Linux with commit a77a94f86273 (x86/microcode: Default-disable late loading) was backported to stable release v5.15.99 in commit 6d2b3a31, and the Linux configuration was not updated.