tfm_build_manager: Run CMake with verbose option while we face issues

Like https://linaro.atlassian.net/browse/TFC-615 (some generated file
intermittently produce errors while compiling), etc.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I51e06ed2fb3d29f13db2fff222db902ba2351c0b
1 file changed