linux-yocto_6.1: ignore backported CVEs

These CVEs have all been fixed in 6.1 point releases.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>