Use signed type for status codes am: 107b27fd84 am: 0ce2ce0fb2 am: 4620914579 am: 7f006e9daf am: e71bb8618b

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/1823179

Change-Id: Ife8e3e764dc9a3bbc7e045ff9371cd538aa4a73e