configs/qemu: bump to the latest linux version

configs/qemu: bump to the latest linux version

ppc-mpc8544ds: switch to custom kernel config since the new 4.3-shipped
mpc85xx_basic_defconfig doesn't work with Qemu.
Incidentally while cleaning it up it now seems to work fine with newer
qemu versions.

sparc64_sun4u: ditch ne2k driver since it's useless, and add the e1000
driver which works fine.

x86: stick to 4.2.x kernels since 4.3 doesn't work right with uclibc
(any variant) based toolchains.

Results table:

Defconfig               Kernel          Qemu    Network Status
--------------------------------------------------------------
aarch64_virt            4.3             2.3.0   YES     OK
arm_nuri                3.10.93         2.3.0   NO(1)   OK(2)
arm_versatile           4.3             2.3.0   YES     OK
arm_vexpress            4.3             2.3.0   YES     OK
microblazebe            4.3             2.3.0   YES     OK
microblazeel            4.3             2.3.0   YES     OK
mips64el_malta          4.3             2.3.0   YES     OK
mips64_malta            4.3             2.3.0   YES     OK
mipsel_malta            4.3             2.3.0   YES     OK
mips_malta              4.3             2.3.0   YES     OK
ppc_g3beige             4.3             2.3.0   YES     OK
ppc_mpc8544ds           4.3             2.3.0   YES     OK
ppc_virtex_ml507        4.3             2.3.0   NO      OK
ppc64_pseries           4.3             2.3.0   YES     OK
sh4                     4.3             2.3.0   YES     OK
sh4eb                   4.3             2.3.0   NO(1)   OK
sparc_ss10              4.3             2.3.0   YES     OK
sparc64_sun4u           4.3             2.3.0   YES     OK
sparc_sun4u             4.3             2.3.0   YES     OK
x86                     4.2.6           2.3.0   YES     OK(3)
x86_64                  4.3             2.3.0   YES     OK
xtensa_lx60             4.3             2.3.0   YES     OK

(1) - Supposed to work but broken, probably Qemu emulation issue
(2) - In like 1/3 runs it fails to start properly
(3) - linux 4.3.0 doesn't like uclibc-based toolchains (net issues)

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>