[PATCH] arm64: add HAVE_LATENCYTOP_SUPPORT config

[yalin wang]

i just enable it on ARM64,
and it can work,
i don’t see some special requirement to enable this config .
> On Nov 7, 2015, at 00:05, Will Deacon <will.deacon at arm.com> wrote:
> 
> On Fri, Nov 06, 2015 at 11:57:58PM +0800, yalin wang wrote:
>> Add HAVE_LATENCYTOP_SUPPORT in Kconfig, so that
>> we can enable this feature on ARM64
> 
> Do you know what the prerequisites for HAVE_LATENCYTOP_SUPPORT actually
> are (beyond those explicitly listed as dependencies for CONFIG_LATENCYTOP)?
> 
> Will