x86/acpi: Rename fields in the acpi_madt_multiproc_wakeup structure

x86/acpi: Rename fields in the acpi_madt_multiproc_wakeup structure

In order to support MADT wakeup structure version 1, provide more appropriate
names for the fields in the structure.

Rename 'mailbox_version' to 'version'. This field signifies the version of the
structure and the related protocols, rather than the version of the mailbox.
This field has not been utilized in the code thus far.

Rename 'base_address' to 'mailbox_address' to clarify the kind of address it
represents. In version 1, the structure includes the reset vector address. Clear
and distinct naming helps to prevent any confusion.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Tao Liu <ltao@redhat.com>
Link: https://lore.kernel.org/r/20240614095904.1345461-15-kirill.shutemov@linux.intel.com