arch/cpu: Rename mp_get_apic_id() and add_cpu_map_entry() function

This patch renames mp_get_apic_id() to cpu_get_apic_id() and
add_cpu_map_entry() to cpu_add_map_entry() in order access it
outside CONFIG_PARALLEL_MP kconfig scope.

Also make below changes
- Make cpu_add_map_entry() function available externally to call
it from mp_init.c and lapic_cpu_init.c.

BRANCH=none
BUG=b:79562868

Change-Id: I6a6c85df055bc0b5fc8c850cfa04d50859067088
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32701
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/include/cpu/x86/mp.h

@@ -145,9 +145,6 @@ int mp_run_on_all_cpus(void (*func)(void *), void *arg, long expire_us);
  */
 int mp_park_aps(void);
 
-/* Returns APIC id for coreboot CPU number or < 0 on failure. */
-int mp_get_apic_id(int logical_cpu);
-
 /*
  * SMM helpers to use with initializing CPUs.
  */