Revert commit "Workaround: Setup register context for BL3-3"
This reverts commit 033c52b
because the workaround it introduced is no longer needed since
BL3-1 interface rework.
This does not revert the change on BL33 base address on Juno, though.
Change-Id: Idc747718a0af94c54931d4a9932f145350b0a75f