Change per-boot tag and remove rescope auth timeout tag.

Change the boolean KM_TAG_SINGLE_USE_PER_BOOT to an integer-valued
KM_TAG_USES_PER_BOOT.  This makes it more flexible without changing
implementation complexity.

Remove KM_TAG_RESCOPE_AUTH_TIMEOUT because there's no clear use case and
it seems unnecessarily complex.

Change-Id: Iad1512f5cc80f517e5ea7622288179c162bed2ad
1 file changed