Use android.os.SystemProperties on Java

It is infeasible to auto-generate JNI(=cc_library_shared) when building
java_library, so JNI will not be used for generated Java classes.
Instead, android.os.SystemProperties functions will be used as base API
for now.

Bug: 80125326
Test: mma -j && sysprop_test
Test: Add sysprop description file as srcs to java_library and build
Change-Id: I0a32bbc47fce4d95a5162dc6ab6e2955b0245c3f