x86/boot/32: De-uglify the 2/3 level paging difference in mk_early_pgtbl_32()

mainline inclusion
from mainline-v6.7-rc1
commit a62f4ca106fd250e9247decd100f3905131fc1fe
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8XRMW


CVE: NA

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

Move the ifdeffery out of the function and use proper typedefs to make it
work for both 2 and 3 level paging.

No functional change.

  [ bp: Move mk_early_pgtbl_32() declaration into a header. ]

Intel-SIG: commit a62f4ca106fd x86/boot/32: De-uglify the 2/3 level paging difference in mk_early_pgtbl_32().
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/20231017211722.111059491@linutronix.de


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