x86/apic: Drop struct local_apic

This type predates recorded history in tglx/history.git, making it older
than Feb 5th 2002.

This structure is literally old enough to drink in most juristictions in
the world, and has not been used once in that time.

Lay it to rest in /dev/null.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Link: https://lore.kernel.org/r/20231102-x86-apic-v1-3-bf049a2a0ed6@citrix.com