eclair/build-tfa.sh: Explicitly remove build dir before each build

E.g., there're seen issues to build juno 64-bit after juno 32-bit.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: If9026257ae3b6ee811807561dc8c697ba6810a60
1 file changed