firmware_FAFTSetup: Add more verbose error message

When this test fails, we should let user know what is wrong with his/her
setup. Let's make the error message more verbose.

BUG=chrome-os-partner:34514
TEST=none

Change-Id: I60671b59946f03e3bcdeee46d46a7e9a802b81a5
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34248
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
1 file changed