perfmon: topdown events as peusdo events
perfmon: topdown events as peusdo events

Topdown events are peusdo events exposed by linux,
and are only present on Intel platforms.
Change to clarifies this.

Type: fix

Signed-off-by: Ray Kinsella <64a50932049ddff830412e0fd9edb30198bf17f3@ashroe.eu>
Change-Id: I6a3dcea5f43f53dbb96475329baf5e596a24d54f

FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp