x86/microcode/intel: Cleanup code further

mainline inclusion
from mainline-v6.7-rc1
commit 0177669ee61de4dc641f9ad86a3df6f22327cf6c
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8XRMW


CVE: NA

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

Sanitize the microcode scan loop, fixup printks and move the loading
function for builtin microcode next to the place where it is used and mark
it __init.

Intel-SIG: commit 0177669ee61d x86/microcode/intel: Cleanup code further.
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/20231002115902.389400871@linutronix.de


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