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

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

Change-Id: I8a0271e009b3b1b8cb6fec5487cea3722de2d7f9