sh: Use a per-cpu ASID cache.

Previously this was implemented using a global cache, cache
this per-CPU instead and bump up the number of context IDs to
match NR_CPUS.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/processor.h

@@ -66,6 +66,7 @@ enum cpu_type {
 struct sh_cpuinfo {
 	unsigned int type;
 	unsigned long loops_per_jiffy;
+	unsigned long asid_cache;
 
 	struct cache_info icache;	/* Primary I-cache */
 	struct cache_info dcache;	/* Primary D-cache */