fix(juno): disable debug builds for tbb w/ stack protector enabled

Juno has run into size constraints affecting BL2. This issue spills over
when we try and compile TF-A with TBB and stack protector enabled. While
we try to figure out a long term solution to this problem, make this a
release build to conserve memory.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: I63010999fd198ec0e74f0b47a29985b10a70a8a0
1 file changed