x86/microcode: Mop up early loading leftovers

mainline inclusion
from mainline-v6.7-rc1
commit 8529e8ab6c6fab8ebf06ead98e77d7646b42fc48
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8XRMW


CVE: NA

--------------------------------

Get rid of the initrd_gone hack which was required to keep
find_microcode_in_initrd() functional after init.

As find_microcode_in_initrd() is now only used during init, mark it
accordingly.

Intel-SIG: commit 8529e8ab6c6f x86/microcode: Mop up early loading leftovers.
Microcode restructuring backport.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231017211723.298854846@linutronix.de


[ Aubrey Li: amend commit log ]
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>