Removed Harness's repeat field.
Added to schemas in e722db14ad,
together with the rest of harness_config.
Added to Harness when it was created.
Now present only in one sample -
mec15xxevb_assy6853 power management sample.
Could not find definitive proof whether it has ever been used.
Signed-off-by: Lukasz Mrugala <lukaszx.mrugala@intel.com>