rse: fix cmake support of RSE_ENABLE_TRAM

RSE_ENABLE_TRAM is used in RSE but not taken into account by Cmake. Fix
this and set it to OFF by default unless overriden.

Change-Id: Ib49e1b96c22e8887699b2296d2855666d1ef6c06
Signed-off-by: Amjad Ouled-Ameur <amjad.ouled-ameur@arm.com>
2 files changed