Commit 21b818c (BL31: Introduce
Exception Handling Framework) introduced the build option
EL3_EXCEPTION_HANDLING, but missed to pass that to the build command
line. This patch fixes that.
Change-Id: I0a1be2c7b41a81e748ad7d6cf795aab7f6d19193
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>