fix(juno): fix certtool not found issue

Juno test config [1] tries to execute the cert create tool without
generating it, and hence ends up in an error:
'tools/cert_create/cert_create: No such file or directory'

To fix this issue explicitly built the cert_create tool so that the test
config [1] can use it for successful certificates generation.

[1]: tf-l2-boot-tests-juno/juno-aarch32-el3-runtime-mbedtls:juno-linux.uboot+aarch32-rt32

Change-Id: I164893dbcec102d7cd6e511a58742ea7a9635bcd
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed