Use 'adb reconnect device' instead of 'kill-server'

Change-Id: Id7f8c484b5715badc73fe611dfec8ccae6ebdb7b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/479718
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Eric Boren <borenet@google.com>