feat(tc): allow TARGET_VERSION=4

Add basic support for TARGET_VERSION=4. It extends the existing 'if'
statements in the Makefile and the header to allow them to take the
value of 4 and also specifies the SCMI platform info to use for TC4.

Change-Id: I8d8257671314277a133e88ef65fae8fada93d00e
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
4 files changed