fvp_utils.sh: gen_fvp_yaml: Output warning if called without template

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I182d7534329bec2c99b97739eb1f8049c00b931a
(cherry picked from commit a3c5a4c06243c1404de6ecc75e07afab754736ac)
1 file changed