Revert "tc2: Added RSS flash file to the real flash"

Now RSS binaries are part of FIP.
The previous change to concatenate RSS flash and FIP is no longer required.

This reverts commit 53af3392.

Change-Id: I4a73a30c4528e529d385171a123c6b8d84b0853b
Signed-off-by: Tintu Thomas <tintu.thomas@arm.com>