x86: acpi use cpu_physical_id

This is from an earlier message from Christoph Lameter:

    processor_core.c currently tries to determine the apicid by special casing
    for IA64 and x86. The desired information is readily available via

	    cpu_physical_id()

    on IA64, i386 and x86_64.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

Additionally, boot_cpu_id needed to be exported to fix compile errors in
dma code when !CONFIG_SMP.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/x86/kernel/mpparse_64.c

@@ -57,6 +57,8 @@ unsigned long mp_lapic_addr = 0;
 
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_id = -1U;
+EXPORT_SYMBOL(boot_cpu_id);
+
 /* Internal processor count */
 unsigned int num_processors __cpuinitdata = 0;