feat(st): use clean_build in tf-cov-make

Using clean_build instead of make in tf-cov-make for ST platforms will
allow displaying the build options.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Ia9a265a2db37e40b04cb57240e0fc1732e0db0a8
1 file changed