qemu/mips64-malta: update to use kernel 3.5.4

Update to use the latest kernel 3.5.4.
And also update to the latest .config knobs, otherwise we were just
building a mips(32) target which failed miserably.
This config is still flaky, you get a login prompt but usually fail to
login, passing along an init=/bin/sh helps some but crashes are quite
usual.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>