x86/platform: Remove unused function from apb_timer.c

Remove the function is_apbt_capable() that is not used anywhere.

This was partially found by using a static code analysis program
called 'cppcheck'.
Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1419166698-2470-1-git-send-email-rickard_strandqvist@spectrumdigital.seSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/apb_timer.c

@@ -135,14 +135,6 @@ static inline void apbt_clear_mapping(void)
 	apbt_virt_address = NULL;
 }
 
-/*
- * APBT timer interrupt enable / disable
- */
-static inline int is_apbt_capable(void)
-{
-	return apbt_virt_address ? 1 : 0;
-}
-
 static int __init apbt_clockevent_register(void)
 {
 	struct sfi_timer_table_entry *mtmr;