trusty: Add IStatsSetter interface

Add android.trusty.stats.nw.setter.IStatsSetter interface
for sending an IStats interface from Android to Trusty.

Bug: 259517277
Test: /data/nativetest64/vendor/trusty_stats_test/trusty_stats_test
Change-Id: Ie3976cdf069dd47b51477a70eb597c76de79f522