tools/arch/x86/intel_sdsi: Add current meter support

tools/arch/x86/intel_sdsi: Add current meter support

Add support to read the 'meter_current' file. The display is the same as
the 'meter_certificate', but will show the current snapshot of the
counters.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240411025856.2782476-10-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>