refactor(fvp): rename the DTB info structure member

In line with the previous patch, the name of the member of the
hw_config DTB info structure has been renamed.

Change-Id: I6689e416fecd66faa515e820f1c4b23bcb65bfb1
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
3 files changed