Add API to query MTE state of device

Test: atest MemtagBootctlTest -- \
      --template:map preparers=template/preparers/feature-flags \
      --flag-value enterprise/android.app.admin.flags.is_mte_enabled=true
Bug: 322777918
Change-Id: I336ddda78f380de3bb4d38dffccaa20b1671f817
3 files changed