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

Results table:

Defconfig               Kernel  Qemu            Network Status
--------------------------------------------------------------
aarch64_virt            4.7     2.6.0           YES     OK (3)
arm_versatile           4.7     2.5.0           YES     OK
arm_vexpress            4.7     2.5.0           YES     OK
m68k_mcf5208            4.7     2.5.0           YES     OK
m68k_q800               4.7     q800-v2.4.0     NO (2)  OK
microblazebe            4.7     2.5.0           YES     OK
microblazeel            4.7     2.5.0           YES     OK
mips32r2el_malta        4.7     2.5.0           YES     OK
mips32r2_malta          4.7     2.5.0           YES     OK
mips32r6el_malta        4.7     2.6.0           YES     OK (3)
mips32r6_malta          4.7     2.6.0           YES     OK (3)
mips64el_malta          4.7     2.5.0           YES     OK
mips64_malta            4.7     2.5.0           Y...