arch/x86/kernel/cpu/perf_event_intel_uncore.h: make UNCORE_PMU_HRTIMER_INTERVAL 64-bit

arch/x86/kernel/cpu/perf_event_intel_uncore.h: make UNCORE_PMU_HRTIMER_INTERVAL 64-bit

i386 allmodconfig:

arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function 'uncore_pmu_hrtimer':
arch/x86/kernel/cpu/perf_event_intel_uncore.c:728: warning: integer overflow in expression
arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function 'uncore_pmu_start_hrtimer':
arch/x86/kernel/cpu/perf_event_intel_uncore.c:735: warning: integer overflow in expression

Cc: Zheng Yan <zheng.z.yan@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>