Bootrom: Changed FFFF end-of-element table marker from 0x00 to 0xfe
Bootrom: Changed FFFF end-of-element table marker from 0x00 to 0xfe

Per discussion with Olin, made the FFFF EOT marker non-zero, non-FF, like the
TFTF EOT marker.
NOTE: This is a companion to the Bootrom Tools commit!

Testing Done: Verified FFFF file with display-ffff
Bug Number: ENG-442
Review URL: https://reviews.leaflabs.com/r/1635/
Reviewed by: Jun Li, Eli Sennesh

Signed-off-by:  Morgan Girling <980e61e2e2b82c453db57c2e8646c01fbd3318cd@bsquare.com>

projectara/bootrom,gregkh/bootrom