fix(realm): add BP_OPTION to REALM_CFLAGS

Adds missing BP_OPTION to REALM_CFLAGS to
allow build realm payload with BTI/Pauth support.

Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
Change-Id: I52bb24ffff9d662fee30706290805c455dc3137a
1 file changed