Platform: Only put TF-M code to ER_TFM_CODE

The ER_TFM_CODE should only pick the real TF-M code,
rather than anything that does not match any pattern.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I13f8dba385c14fed06a4910d48859a25a0b5bd6f
5 files changed