libftdi: Fix license format QA error

Fix following QA error:

,----
| WARNING: Recipe libftdi, LICENSE (LGPLv2.1 GPLv2) has invalid format,
|     LICENSES must have operator "([&|() ])" between them.
`----

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>