feat(sgi575): remove SGI-575 from deprecated list

As SGI-575 is not planned to be deprecated in the upcoming release
cycles, remove it from the deprecated list.

Change-Id: Ic9171a3e1bec198d9305e75ac5cae4b40498537e
Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
2 files changed