genericarm64.conf: increase initramfs size
With firmware files and more kernel modules the size
limit is hit again. Increase by 60Mb.
(From meta-yocto rev: 4348f496cf4950cf665d7c56643718b5238e96bf)
Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>