configs/qemu: bump to latest version

configs/qemu: bump to latest version

Also bump the pc samples since they're tied to the (base) qemu config.

Results table:

Defconfig               Kernel  Qemu            Network Status
--------------------------------------------------------------
aarch64_virt            4.5.6   2.5.0           YES     OK (4)
arm_versatile           4.6.1   2.5.0           YES     OK
arm_vexpress            4.6.1   2.5.0           YES     OK
m68k_mcf5208            4.6.1   2.5.0           YES     OK
m68k_q800               4.6.1   q800-v2.4.0     NO (3)  OK
microblazebe            4.6.1   2.5.0           YES     OK
microblazeel            4.6.1   2.5.0           YES     OK
mips64el_malta          4.6.1   2.5.0           YES     OK
mips64_malta            4.6.1   2.5.0           YES     OK
mipsel_malta            4.6.1   2.5.0           YES     OK
mips_malta              4.6.1   2.5.0           YES     OK
ppc_g3beige             4.6.1   2.5.0           YES     OK
ppc_mpc8544ds           4.6.1   2.5.0           YES     OK
ppc_virtex_ml507        4.6.1   2.5.0           NO      OK
ppc64_pseries           4.6.1   2.5.0           YES     OK
sh4                     4.6.1   2.5.0           YES     OK
sh4eb                   4.6.1   2.5.0           NO (1)  OK
sparc_ss10              4.6.1   2.5.0           YES     OK
sparc64_sun4u           4.6.1   2.5.0           YES     OK
sparc_sun4u             4.6.1   2.5.0           YES     OK
x86                     4.6.1   2.5.0           YES     OK
x86_64                  4.6.1   2.5.0           YES     OK
xtensa_lx60             4.6.1   2.6.0           YES     OK (2)
xtensa_lx60_nommu       4.6.1   2.6.0           YES     OK (2)

(1) - Probably an endian issue with 8139 emulation/driver
(2) - Linux 4.5/4.6 doesn't work with older Qemu versions
(3) - There's a network interface, but enabling it in qemu fails
(4) - Console looks dead in 4.6

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