Link the "runtime" namespace to more namespaces.

The canonical location of the HWASAN runtime, an LL-NDK library, is being moved
to the runtime APEX. It is apparently the first LL-NDK library in the runtime
APEX that does not require a legacy symlink in /system/${LIB}. Therefore we
need to link the HWASAN runtime in the runtime namespace to various namespaces
so that the library can be loaded from outside of the namespace.

Also, add $SANITIZER_RUNTIME_LIBRARIES to
namespace.default.link.system.shared_libs. This is necessary because in
the accompanying Soong change, we cause the HWASAN runtime to be removed
from $LLNDK_LIBRARIES. In most cases, except for this one, this was a no-op
because we were already including both sets of libraries in shared_libs.

Change-Id: I67d64788855d28f3a156a1b9cf8a897617277730