buildroot

fbgrab: Fix some problems in the patch metadata

The patch description was missing Upstream-Status tag. It was given in the
commit which added this patch but not in the patch itself as should be.

Signed-off-by tag accidentally didn't follow the usual format.

Signed-off-by: Timo Ketola <timo.ketola@exertus.fi>
Reviewed-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>