tools: Remove TODO from fiptool
tools: Remove TODO from fiptool

It is quite unlikely that this number will ever change and, if it
does need to change, we should have a good reason to do so. It
seems that this comment is now redundant.

Change-Id: I409c764080748e338e9bc5606bbdcc475213fb6e
Signed-off-by: Paul Beesley <8414e4843aab463885be16eab9f09388385653d9@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware