drm/i915/tgl: add modular FIA to device info

Tiger Lake has modular FIA bit indicating if we are using it, so add to
the device info.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190712055706.12143-3-lucas.demarchi@intel.com