fmap: fmap_create() takes const name fmap_create() doesn't modify this param. BUG=b:288327526 TEST=build Change-Id: Icd2c4a2a57e13e27fe22a664ce40b4727afdf4ae Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashmap/+/5034761 Reviewed-by: Jack Rosenthal <jrosenth@chromium.org> Commit-Queue: Brian Norris <briannorris@chromium.org> Tested-by: Brian Norris <briannorris@chromium.org>