[ALPHA] Fix hard_smp_processor_id compile error

[Simon Horman <horms@verge.net.au>]

"Remove hardcoding of hard_smp_processor_id on UP systems",
2f4dfe206a2fc07099dfad77a8ea2f4b4ae2140f in Linus' tree, moved
the definition of hard_smp_processor_id linux/smp.h to asm/smp.h
for UP systems. This causes a regression on Alpha.

cc1: warnings being treated as errors
arch/alpha/kernel/setup.c: In function 'setup_arch':
arch/alpha/kernel/setup.c:506: warning: implicit declaration of function 'hard_smp_processor_id'
make[1]: *** [arch/alpha/kernel/setup.o] error 1
make: *** [arch/alpha/kernel] error 2

By including asm/smp.h non-conditionally in asm/mmu_context.h
the problem appears to be resolved.

Cc: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Simon Horman <horms@verge.net.au>

Index: linux-2.6/include/asm-alpha/mmu_context.h
===================================================================
--- linux-2.6.orig/include/asm-alpha/mmu_context.h	2007-05-14 16:29:22.000000000 +0900
+++ linux-2.6/include/asm-alpha/mmu_context.h	2007-05-14 16:29:40.000000000 +0900
@@ -85,8 +85,8 @@ __reload_thread(struct pcb_struct *pcb)
  * +-------------+----------------+--------------+
  */
 
-#ifdef CONFIG_SMP
 #include <asm/smp.h>
+#ifdef CONFIG_SMP
 #define cpu_last_asn(cpuid)	(cpu_data[cpuid].last_asn)
 #else
 extern unsigned long last_asn;
-
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