x86/boot: Use __pa_nodebug() in mk_early_pgtbl_32()

Use the existing macro instead of undefining and redefining __pa().

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231017211722.051625827@linutronix.de