refactor(tc): Make tc0 tftf code generic to tc.

This code can be used for tc0, tc1 and tc2 testing so change from
tc0 naming to tc.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: Ied011db0cd688936d6ba20e48c5206de4891e732
25 files changed