Add a sysprop-as-API for Trusty Android properties

This provides access to the Android system properties that Trusty
defines. It does not grant any access to these properties from within
Trusty itself.

Bug: 382335252
Test: Use libtrustyproperties_rust in a rust_binary, call
Test: `trustyproperties::trustproperties::vm_cid()`
Change-Id: I7426eeaf6bee5cdb1eb644044a50953063440906