crosvm_control: Add shared and unevictable memory to BalloonStats
crosvm_control: Add shared and unevictable memory to BalloonStats

Adds the shared_memory and unevicatble_memory fields to BalloonStatsFfi
struct and also returns them from crosvm_client_balloon_stats.

BUG=b:188858559
TEST=cq

Change-Id: I9ff52b77cd19e16a860596f24ff45407a2acdd1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3713864
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Noah Gold <2d4550d8af93bfc6e6fbe1fb1b0cc97a9ee7c3ce@google.com>
Commit-Queue: Kameron Lutes <d812b9f24eeb5acef9cc7e601b6b603be1696a90@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm