bluetooth: remove BT_TINYCRYPT_ECC in bluetooth mesh tests

Some bluetooth test were using BT_TINYCRYPT_ECC without also
setting BT_ECC. This means that BT_TINYCRYPT_ECC gets disabled
as it depends on BT_ECC.
This commit fix this by removing BT_TINYCRYPT_ECC in all test
for bluetooth mesh.

Signed-off-by: Valerio Setti <vsetti@baylibre.com>