x86/microcode: Provide CONFIG_MICROCODE_INITRD32

mainline inclusion
from mainline-v6.7-rc1
commit fdbd43819400e74c1c20a646969ea8f71706eb2b
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8XRMW


CVE: NA

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

Create an aggregate config switch which covers X86_32, MICROCODE and
BLK_DEV_INITRD to avoid lengthy #ifdeffery in upcoming code.

Intel-SIG: commit fdbd43819400 x86/microcode: Provide CONFIG_MICROCODE_INITRD32.
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/20231017211722.236208250@linutronix.de


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