ATH 12.4.0 CS is based on 6.1 kernel and thus we need to add a tarball
hash, so we could build the kernel.
References: PCF-1176
Signed-off-by: Marvin Lu <marvin.lu@wnc.com.tw>
Signed-off-by: Petr Štetiar <petr.stetiar@prplfoundation.org> [commit description]
(cherry picked from commit ac99cc80a976b9d807048d9781b4d02b6202d796)