perf_counter: remove perf_disable/enable exports

Now that ACPI idle doesn't use it anymore, remove the exports.

[ Impact: remove dead code/data ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20090515132018.429826617@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/perf_counter.c

@@ -90,14 +90,12 @@ void perf_disable(void)
 	__perf_disable();
 	hw_perf_disable();
 }
-EXPORT_SYMBOL_GPL(perf_disable); /* ACPI idle */
 
 void perf_enable(void)
 {
 	if (__perf_enable())
 		hw_perf_enable();
 }
-EXPORT_SYMBOL_GPL(perf_enable); /* ACPI idle */
 
 static void
 list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)