rkp_factory_extraction_tool: Add instance name in the JSON output

Since we maybe have more than 1 RKP instances on the device, add the
instance name in JSON for better visibility.

Bug: 223509807
Test: libkeymint_remote_prov_support_test

Change-Id: I1657ecb3abba886f2f7682997e72e428f3d6993e
1 file changed